Lillian Chapin

“ A second current of air was now directed through the tube into another Petri dish. This dish developed 240 colonies of yellow bacteria.
The above is merely suggestive of the kind of work that might be done in any secondary school. Most of these experiments could be performed by the average high school senior. All of them could be used as class demonstrations. Each one has a direct bearing on some large question of preventive medicine. A week's training in bacteriological technic will enable any teacher to give this work. ”

“ HYGIENE is the one secondary school subject that every pupil will find necessary throughout life. In few high schools, however, has it received the treatment a subject of such importance demands. This article is a plea for definite, forceful experiments and demonstrations in hygiene comparable with the experiments and demonstrations so long deemed essential in physics and chemistry. The following experiments could be done in any secondary school.
1. To demonstrate Bacteria in the Air.—A test-tube of sterile nutrient agar was melted by immersing it in boiling water. ”