DEKTUBE

You will find that the gelatine

We are indebted to Professor Quekett, of the College of Sur geons, now President of the Microscopical Society o London, Tory Burch Outlet for having pointed out a remarkable fact with regard to the bonecells; and that Tory Burch Outlet is, that they correspond in size with the size of the bloodglobules. You know that animals contain in their blood, cells called bloodcells, which Tory Burch Outlet vary in size in different animals. Burberry Outlet Itithe human being the globules are the ,th part of an inch in diameter, and in the bones of the human being the bonecells are the ,th of an inch in diameter; in birds they are about the ,th of an inch in diameter, whilst the blood globules are the ,th; in reptiles the bloodcells are not more than the sevenhundredth or a thousandth part of an inch in diameter, and the bonecells not more than the fivehundredth or a thousandth. There is, then, a general correspondence between the size of these two sets of cells; but there are numerous exceptions, and the statement must only be looked upon as expressive of a general relation.Having said thus much with regard to the microscopical structure of bone, let me now call your attention to its chemical composition. The following is the general composition of bonenot of human bones or ox bones in particular, but of bone generally:Organic matter, parts ; phosphate of lime, parts; carbonate of lime, parts; fluoride of calcium, part; other salts, part., the part which composes the organic tissue, and the fat, which constitutes the marrow, constitute the parts; while the substance known as boneearth phosphate of lime consists of parts; and then we have common chalk carbonate of lime in our bones, and the bones of all the higher animals, in the proportion of per cent.; and we have also a little Derbyshire spar fluoride of calcium, per cent. Why it is there we do not know ; but there it is, and it is very generally present in the higher animals. Then there are sulphates of soda, potash, and magnesia; other salts about I shall now proceed to point out the properties of these constituents, because the properties of these substances are the properties which render the bone so valuable in the arts.

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