The Alumni Journal of the College of Pharmacy of the City of New York, Vol. II, No. 2, February, 1895

The Alumni Journal of the College of Pharmacy of the City of New York, Vol. II, No. 2, February, 1895

between the crisis and the complete recovery from an acute disease, that period known as convalescence, can often be considerably shortened by a judicious attention to the patients nutrition. The battle has indeed been won, but the soldier is left prostrate upon the field. provides a valuable auxiliary for his up building because it is a liquid food-agent possessing a powerful reconstructive action while at the same time it is slightly stimulating in its primary effects. It is entirely pre-digested and in an absolutely aseptic condition. In convalescence, Doctor, give your patient Liquid Peptonoids The topic of my lecture this evening is one of my old hobbies, so that if I am a little prolix sometimes you must pardon me. It is something in which I have been more or less interested for the last twenty-five years, and, like most of our hobbies, we sometimes drive them to death, to the discomfort of other people. The fundamental ideas upon which photography is based are very oldolder than the Christian era, certainly. They depend upon two facts: Firstthat light, in passing through a small opening, produces an inverted image in a dark chamber. Imagine, for instance, that you are in a dark chamber, outside of which is an object; that there is in the chamber a small hole a sixteenth or an eighth of an inch in diameter, and that you have in this dark chamber a piece of paper. Upon that paper you will get a picture of the object opposite the hole. That was known a long time ago. The other fact is that certain salts of silver, notably the chloride, iodide and bromide of silver, are sensitive to light and become blackened by light, was known to the Egyptians. The action of light upon colored bodies must have been known to the very earliest observers among men. The bronzing of the human skin under the tropical sun must have been noted by every one; and it is on record, in the most ancient annals of the human race, that menthe fair men from the Northwhen they went to the tropics, returned with tanned skins. Ptolemy, over two thousand years ago, noted that beeswax was bleached in sunlight, and the old Greeks noted that the gems which we call opal and amethyst lost their colors when exposed to sunshine. These are some of the first and most rudimentary notions upon the actions of light, and we have no definite statements about making pictures without light. The Chinese have a traditionand they have a great many curious ones that are often founded on factsthat the sun makes pictures upon the ice of lakes and rivers. ......Buy Now (To Read More)

Product details

Ebook Number: 52977
Author: Various
Release Date: Sep 4, 2016
Format: eBook
Language: English

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Editor: Kraemer, Henry, 1868-1924