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Updated: June 29, 2025
But still, my judgment is not final; she has youth, and a most amazing nervous strength. It may be best to risk all to win all by employing some violent reagent. But I will not take upon myself to order it; nor will I advise it; in consultation I shall oppose it." Jules returned to his wife.
To her, it was the divine reagent of all Life's complicated chemistry; the swift turning of the prism, with ragged edges breaking the light into the colours of the spectrum, to a point where refraction was impossible. "I did," Edith sighed, "but marriage is a great strain upon love." The silvery cadence of Madame's laughter rang through the house and echoed along the corridor.
To prevent this as far as possible, they are washed with solutions of volatile salts, as will be described in some of the following procedures. In all precipitations the reagent should be added slowly, with constant stirring, and should be hot when circumstances permit.
With her maternal foresight, the bluebottle knows to perfection the choice surfaces, the only ones liable to soften and run under the influence of the reagent dribbled by the newborn grubs. The chemistry of the future is familiar to her, though she does not use it for her own feeding; motherhood, that great inspirer of instinct, teaches her all about it.
The first thing to do in such cases is quickly and thoroughly to flood the eyes with water. Any of the chemical which remains may then be counteracted by the proper reagent, care being taken to use a very dilute solution. To guard against getting the counteractive agent too strong for the inflamed eye, it should first be tried on an eye that has not been injured.
Among the most interesting researches of Spallanzani were his experiments to prove that digestion, as carried on in the stomach, is a chemical process. In this he demonstrated, as Rene Reaumur had attempted to demonstrate, that digestion could be carried on outside the walls of the stomach as an ordinary chemical reaction, using the gastric juice as the reagent for performing the experiment.
The tendency of the magnesium precipitate to carry down molybdic acid is also increased if the solution is too concentrated. The slow addition of the reagent is essential, and the stirring not less so. Stirring promotes the separation of the precipitate and the formation of larger crystals, and may therefore be substituted for digestion in the cold.
Here again, then, it is to uric acid, present, however, in small quantities in the adipose tissue, that the caterpillar's rich livery is due. The black parts are an exception. Unassailable by nitric acid, they retain their sombre tint after treatment as before, whereas the portions stripped of their pigment by the reagent become almost as transparent as glass.
but there is no reagent that will redden the faded roses of eighteen hundred and spare them! But, as I was saying, phosphorus fires this train of associations in an instant; its luminous vapors with their penetrating odor throw me into a trance; it comes to me in a double sense "trailing clouds of glory."
For five years all toxicologists made constant tests until apparently quite by accident Professor Sonnenschein, of Hanover, discovered the reagent which would reveal the actual glucosid, and determine its identity. It gives a yellowish-white precipitate," he added, holding up for my inspection a small test-tube containing a liquid of the colour he had indicated. "Marvellous!" I exclaimed.
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