2012, ISBN: 9781235256530

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustra… More...

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1838 Excerpt: ...and diluted it with serum, so that the blood corpuscles lay completely scattered about and separated from each other, I observed that in the interval between the blood-corpuscles a coagulum of previously dissolved matter was produced, by which the whole separated blood-globules were connected together. I was then able to remove at the same time all the blood-corpuscles, notwithstanding their wide distribution and the size of the intervals between them, by raising with a needle the fibrous coagulum occupying the intervening spaces. As the bloodcorpuscles of the frog are rendered by a microscope uncommonly large, this observation admits of the greatest distinctness, and allows no ambiguity to remain on the subject. There is still however an easier and more convincing method of proving that fibrin is dissolved in frog's blood. As I showed from experiment that the blood-corpuscles of the frog are about four times larger than the blood-corpuscles of men and mammalia, I concluded that perhaps the filter would keep them back, while it allowed the corpuscles of men and mammalia to pass. This is the case. The experiment may be made on a small scale with tne blood of a frog alone; a small glass funnel and a filter of common white filtering-paper or thick printing paper are the only requisites. The paper must previously be moist, and it is well, to add an equal quantity of water to the fresh blood, of the frog. The liquid which flows through the filter is an almost colourless clear serum diluted with water, with a slight tinge of red, from the colouring matter dissolved In the water. As however the solution of the colouring matter of frog's blood by water requires a considerable time, the filtered fluid can scarcely be termed reddish, and is sometimes quite colourless... Weight:2.72 lbs, RareBooksClub.com, 5/14/2012 0:00:00<