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Updated: June 12, 2025
It is now established that nitrogen is as essential a constituent of vegetable as of animal living matter; and that the latter is, chemically speaking, just as complicated as the former. Starchy substances, cellulose and sugar, once supposed to be exclusively confined to plants, are now known to be regular and normal products of animals.
"It's better than vitamin lamps," Ringg admitted, "even if it's not very bright." Bart wondered, suddenly and worriedly, about the effects of green sunburn on his chemically altered skin tone. "Well, let's enjoy it while we can," Ringg said, "because it seems to be clouding over. I wouldn't be surprised if it rained." He yawned. "I'm getting bored with this voyage.
David's. But this is a subject too deep for our present purpose, and so we shall continue to treat of the Great Lakes in another point of view. Chemically considered, these lakes possess peculiar properties, according to their boundaries. Superior is too little known to speak of with certainty Huron not much better but Erie, and particularly Ontario, have been well investigated.
When they are placed in suitable conditions of pressure and time, they flow through orifices, transmit pressure in all directions, diffuse and dissolve one into the other, and react chemically on each other.
It is far more important and more practicable to follow out the course of this mercantile and strategical growth of the city of Rome, than to attempt the useless task of chemically analysing the insignificant and but little diversified communities of primitive times.
The very beginning was made in 1824 by Rolando, who first thought of cutting chemically hardened pieces of brain tissues into thin sections for microscopical examination the basal structure upon which almost all the later advances have been conducted.
The muriatic acid of commerce has usually a yellowish tinge, but when chemically pure it is colorless. The former is commonly contaminated with sulphurous acid, sulphuric acid, chlorine, iron, and sometimes with arsenic. Muriatic acid, from the fact of the presence of the chlorine, is used in the Daguerreotype process for dissolving gold, and in combination with various accelerators.
Examined chemically, it proves to be composed almost wholly of carbonate of lime; and if you make a section of it, in the same way as that of the piece of chalk was made, and view it with the microscope, it presents innumerable Globigerinæ embedded in a granular matrix. Thus this deep-sea mud is substantially chalk.
This, of course, has in it much vegetable matter in various stages of decay, and a mixture of it with a small quantity of bone-meal would form a manure superior, as I shall afterwards show when I come to treat of top soil, to farmyard manure chemically, and superior to it from a physical point of view.
Here then we have the criterion that was wanted the means of distinguishing, spectroscopically and chemically, between the cavity and the absorbing layers piled up above it.
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