Parasol

“ So faithful, indeed, is the Parasolia in this respect that a distinguished scientist, formerly superintendent of the National Weather Bureau, once confessed (in a private interview printed confidentially in the Evening Post) that his success in telling whether or no the sun were shining was entirely due to his watching the flowers of the Parasolia. ”

“ But if there were not Water to coole our Earth, and Aire, then the Earth would be dryed, for these two reasons, viz. by reason of the Motion of the Centrall Sun, and heat of the Celestiall: Neverthelesse it happens sometimes in some places, when the pores of the earth are obstructed, that the humidity, or water cannot penetrate, that then by reason of the correspondency of the Celestiall, and Centrall Sun (for they have a magnetick vertue betwixt themselves) the earth is inflamed by the Sun: so that even sometimes there are made great chops, or furrows in the earth. ”

“ These cases occur on exposure to the direct action of the sun's rays when the atmospheric temperature is also high, and especially when unusual exertion is made, or when the individual is depressed by previous illness or the exhaustion due to dissipation, intemperance, or even undue indulgence in stimulants.
But the most serious cases are those that come on under cover by night as well as by day, and apart from the direct solar rays. Heat alone, especially when the atmosphere is loaded with moisture so as to prevent evaporation from the person, is the real cause of the disease. ”

“ I will notice one of the principal causes having a tendency to prevent the perfect uniformity of chemical action, between the iodine and silver; hydrogen, or the moisture in the atmosphere, makes a very perceptible barrier. This moisture may arise as the result of the cold, from a want of friction in the buffing of the plate, which, coming in contact with the warmer air, as a writer on this subject says:
“It is well known that as often as bodies, when cold, are exposed to a warmer air, the humidity contained in them is condensed. ”

“ If we add moisture to a sunless spot, we have the ideal environment for germs to breed and flourish in. There is always moisture or humidity in the air if the altitude is low, and if it is near the ocean, or any large body of water, the moisture is relatively greater. For this reason we send patients with pulmonary disease to the mountains, where the altitude is much higher, where there is no moisture, and consequently where there are practically no germs. ”

“ The slightest change in the purity of the atmosphere, though it may be too slight for recognition by chemical analysis in the laboratory, is sure to be detected by its effects upon the nicer chemistry of the human system, for it is known to be productive of disease and death. No chemical tests are sensitive enough to tell us what those changes are, but experience has taught us the necessity of ventilation in our buildings, of circulation through our groves. The cry in cities for fresh air from the mountains or the sea, reminds us continually of the life-giving virtues of circulation. ”

“ The air is rendered humid by containing INVISIBLE vapor, and it becomes drier by the condensation of such vapor into fog, composed of solid globules or of hollow vesicles of water—for it is a disputed point whether the particles of fog are solid or vesicular. Hence, though the ambient atmosphere may hold in suspension, in the form of fog, water enough to obscure its transparency, and to produce the sensation of moisture on the skin, the air, in which the finely divided water floats, may be charged with even less than an average proportion of humidity. ”

“ Any natural process having a tendency to cool the air, so that its temperature falls to or below the dew-point, without originating any lateral motion to clear away the extraneous atmospheric impregnations which ensue, will contribute very much to concentrate them in the lower portions of the air.
Now this is the case with terrestrial radiation, which, with a clear and calm atmosphere, rapidly diminishes the temperature of certain parts of the earth's surface, and the circumambient air, condensing the vapour it contains, and creating a local, cold, damp, and very often malarious, atmosphere. ”

“ As, by the greater pressure and humidity of the atmosphere, the pores of the skin are so affected that they become unable to perform their office of exhalation, with the same facility as in winter and summer, it follows that perspirable matter, or at least, its grosser particles, will in autumn be liable to remain on the surface, in a state inclining to putrefaction, and to be re-absorbed, to the great detriment of the human or animal body. ”

“ If, by exposure to cold, for example, heat is lost more rapidly from the surface than it is supplied within, its warmth must decrease, and there needs but a few degrees of fall to induce disease; on the other hand, if, by exposure to external heat, loss from the body is impeded, its temperature rises, and disease again results.
In hot climates, or during the hot season in temperate latitudes, we are in contact with an atmosphere which frequently attains a temperature nearly or quite equal to that of the body ”

“ While admitting that there may be cases where the effects of certain rays of the sun are responsible for clinical manifestations varying from death of striking suddenness to vague complaints of irritability, headache and defective memory, yet the generally accepted views are that high temperature, high relative humidity and lack of evaporation from the skin, whether from excessive humidity or from lack of circulation of the surrounding air, can and do produce at one time heat stroke and at another heat prostration. ”

“ Of course in a hot day there is more of the moisture, but the warmth of the atmosphere prevents it from condensation, and so it is not visible.
One valuable property of the system of evaporation and condensation is its cooling power. Thus it is that a person who is ill with fever tosses about with a burning skin until the pores of the body act, and allow the normal moisture to pass through them. Then the body cools by evaporation, and the patient begins to amend. ”

“ In inhabited rooms the moisture increases as much as the organic matter, and the condition of the air is similar to that of the evenings of summer: whenever the temperature goes down a little, there is a deposit of dew; but, when the warmth increases, the air is laden with moisture, and the condition resembles that near a warm close vegetation. In both cases ventilation is wanted. Our walls become saturated with moisture if they are porous, if not porous they are covered with streams of water. ”

“ More disease germs exist in river water in winter than in summer, which may be due to the greater disinfecting power of the sun’s rays during summer.
Dust Motes of the Air. As the earth pursues its course about the sun, dust rains into its atmosphere from outer space. Meteors that are burned through the heat generated by striking into our air contribute to the supply, as do volcanoes, combustion, spray from the ocean, and matter lifted up by the action of the wind. ”

“ Again, if too much moisture enters the channels of a body, and thus introduces disproportion, the other elements, adulterated by the liquid, are impaired, and the virtues of the mixture dissolved. This defect, in turn, may arise from the cooling properties of moist winds and breezes blowing upon the body. In the same way, increase or diminution of the proportion of air or of the earthy which is natural to the body may enfeeble the other elements; the predominance of the earthy being due to overmuch food, that of air to a heavy atmosphere. ”

“ Notwithstanding our imperfect acquaintance with the manner in which water is suspended in the atmosphere, it is well known that the human body is greatly influenced by the aqueous vapour in such a state of suspension, and that the sources of poisonous emanations are active in proportion to the grade of atmospheric humidity and its temperature. An atmosphere surcharged with humidity not only prevents the cuticular discharge necessary to a healthy state, but sensibly diminishes the watery exhalations from the lungs, thereby inducing various morbid effects on the system. ”

“ It is obvious that in any one of the places mentioned and which lies outside the tropics, a living body might encounter days in which it would be heated by solar radiation to a much greater extent than in the tropics, and the only question would be whether the possibility of cooling, such as low air temperature, low humidity, winds or other means would compensate to avoid the effects of such insolation. ”

“ In other words, scientists think that when surface areas darken and expand, relatively more energy from the sun is being absorbed by the surface, which causes temperatures to rise near the surface. This, in turn, produces a less stable atmosphere generating more turbulent eddies and whirling dust devils. The more dust that is redistributed to bright surfaces, the more surfaces darken and expand, which causes more sunlight to be absorbed, increased temperatures, and less stable the atmosphere, say scientists. ”

“ During the night plants only give off carbonic acid.
2. The Fall of Rain clears the atmosphere of any solid particles contained in it, the impurities being transferred to rain-water which generally contains an appreciable amount of ammonia as well as other impurities. Rain not only washes and purifies the air, but by washing the ground, diminishes dust, and prevents its escape into the air. It is the great natural scavenger.
3. Ventilation—that is, the interchange of pure and impure air, is constantly being effected. ”

“ We now see that, as a living organism, it tends, on the one hand, to diminish the humidity of the air by sometimes absorbing moisture from it, and, on the other, to increase that humidity by pouring out into the atmosphere, in a vaporous form, the water it draws up through its roots. ”

“ We cannot for instance in a given case estimate accurately the effect of impurities in the atmosphere such as organic and inorganic dust, nor the effect of differences in degree of its natural qualities such as extremes of heat and cold, sudden variations of temperature, excessive moisture or dryness, different electric conditions, differences of pressure, a deficiency of light, and the amount of ozone, &c. ”

“ You will observe that, however long I draw the external air into the lime-water, and then through it to my lungs, I shall produce no effect upon the water—it will not make the lime-water turbid; but if I throw the air from my lungs through the lime-water, several times Fig. 34. in succession, you see how white and milky the water is getting, shewing the effect which expired air has had upon it; and now you begin to know that the atmosphere which we have spoiled by respiration is spoiled by carbonic acid, for you see it here in contact with the lime-water. ”

“ The matter must be tolerably dry—absolute dryness checks the process, so does excess of moisture. It is stated that about 33 per cent. of moisture is the amount with which the humifying change is most rapid. 2. The access of air is necessary, because the organisms which produce humification are aërobic, and, as much of the change consists of oxidation, it is evident that the free access of air is essential. Actual Practice
It may be well to refer here to what is actually done in my garden at Andover, in Hampshire. ”

“ How will he account for the absolute immunity of a liquid exposed for months in a warm room to optically pure air, and its infallible putrefaction in a few days when exposed to dust-laden air? He must, I submit, bow to the conclusion that the dust-particles are the cause of putrefactive life. And unless he accepts the hypothesis that these particles, being dead in the air, are in the liquid miraculously kindled into living things, he must conclude that the life we have observed springs from germs or organisms diffused through the atmosphere. ”

“ The reason of this is that a free-surface must exist for the condensation of the vapour-particles. The fine particles of dust in the air act as free-surfaces, on which the fog is formed. Where there is abundance of dust in the air and little water-vapour present, there is an over-proportion of dust-particles; and the fog-particles are, in consequence, closely packed, but light in form and small in size, and take the lighter appearance of fog. ”

“ In the hot season, heat from without combines with heat from within, and produces an unhealthful degree of heat in the body, and causes disease of the fire-class. In the rainy season too much water is absorbed into the system, filling intensely the natural vacuum in the upper part of the head, and produces disease of the water-class. The earth produces disease through her mists and vapors. ”

“ These experiments resulted in his discovering the important fact that atmospheric air, after having been corrupted by the respiration of animals, and by the burning of inflammable bodies, is restored to salubrity by the vegetation of plants; and that, if the air is exposed to a mixture of sulphur and iron-filings, its bulk is diminished between a fourth and a fifth, and the residue is both lighter than common air and unfit to support life; this residue he termed 'phlogistic air,' afterwards called azotic or nitrogen gas. ”

“ The effects of external temperature first produce on the functions of the skin (which connects us with the exterior world) an augmentation or diminution of the natural discharges, by suddenly changing or disturbing the balance of the circulating fluids between the external and internal parts or surfaces, irrespective of the perspiratory process, commonly termed sweat, there being innumerable chemical agents more poisonous and of greater importance as to their elimination from the system in the shape of insensible perspiration. ”