FOOTNOTES:
[268] “As to the polishing and grooving of hard rocks, it has lately been ascertained that glaciers give rise to these effects when pushing forward sand, pebbles, and rocky fragments, and causing them to grate along the bottom. Nor can there be any doubt that icebergs, when they run aground on the floor of the ocean, imprint similar marks upon it.”—Principles of Geology, or the modern changes of the Earth and its Inhabitants considered as illustrative of Geology: by Charles Lyell, M.A., F.R.S. Travels through the Alps of Savoy, and other parts of the Pennine Chain, with Observations on the Phenomena of Glaciers: by James D. Forbes, F.R.S.
[269] This may be readily proved by the following simple but instructive experiment:—Take two pairs of watch-glasses; into one pair put a solution of nitrate of silver, into the other a weak solution of iodide of potassium; connect the silver solution of each pair with the potash one by a film of cotton, and carry a platina wire from one glass into the other. Place one series in sunshine, and the other in a dark place. After a few hours it will be found that the little galvanic arrangement in the dark will exhibit, around the platina wire, a very pretty crystallization of metallic silver, but no such change is observable in the other exposed to light. If a yellow glass is interposed between the glass and the sunshine, the action proceeds as when in the dark. This experiment is naturally suggestive of many others, and it involves some most important considerations.
[270] In cases of violent death it is often found the gastric juice has, in a few hours, dissolved portions of the stomach.—Dr. Budd’s Lecture before the College of Physicians.
[271] Faraday’s Experimental Researches, vol. i.; from which a quotation has already been made, showing the enormous quantity of electricity which is latent in matter.
[272] On the Motion of Gases: by Professor Graham, F.R.S.—Phil. Trans., vol. cxxxvi. p. 573.