Litmus

Definition and stakes

Various,  Encyclopaedia Britannica, 11th Edition…

“ LITMUS (apparently a corruption of lacmus, Dutch lacmoes, lac, lac, and moes, pulp, due to association with “lit,” an obsolete word for dye, colour; the Ger. equivalent is Lackmus, Fr. tournesol) , a colouring matter which occurs in commerce in the form of small blue tablets, which, however, consist mostly, not of the pigment proper, but of calcium carbonate and sulphate and other matter devoid of tinctorial value. Litmus is extensively employed by chemists as an indicator for the detection of free acids and free alkalis. ”
Source: Gutenberg

Joseph Woods,  Letters of an Architect, From France…

“ Anchesmus, and the hills about Athens, if not of mountain lime, are perhaps oolitic, though the stone is very hard and compact, and frequently somewhat translucent, and I have not been able to discover any shells in it. There is a conglomerate, where fragments of primitive rocks are united by a calcareous cement, which seems to contain magnesia, and may correspond with our magnesian limestone, while the hills of the Piræus are of a soft calcareous sandstone, containing shells of a much later period. ”
Source: Gutenberg

Baron Edward Bulwer Lytton Lytton,  The Last Days of Pompeii

“ At one side, upon a lofty column of granite, was a colossal head of the blackest marble, which she perceived, by the crown of wheat-ears that encircled the brow, represented the great Egyptian goddess. Arbaces stood before the altar: he had laid his garland on the shrine, and seemed occupied with pouring into the tripod the contents of a brazen vase; suddenly from that tripod leaped into life a blue, quick, darting, irregular flame; the Egyptian drew back to the side of Ione, and muttered some words in a language unfamiliar to her ear ”
Source: Gutenberg

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