508 TISSUES YIELDING GELATIN. 



from cartilage; and by boiling with water is likewise 

 converted into gelatin. 



The teeth also contain the same ingredients as bones, 

 but less organic matter. The tootli-bone, dentine, in 

 man, contains over 64 per cent, of calcium phosphate, 

 over 6 per cent, of calcium and magnesium carbonates, 

 and 28 per cent, of organic matter, affording gelatin. 

 The enamel of the teeth, on the other hand, which con- 

 sists of perpendicular, closely arranged, microscopical 

 -fibres or rods, contains no organic matter similar to that 

 of bone; it contains 84-90 per cent, of calcium phos- 

 phate (with magnesium phosphate and some calcium 

 fluoride), 4-9 per cent, of calcium carbonate, and 3-6 

 per cent, of organic substance. 



The antlers of the deer-family have the same com- 

 position as bones. 



10. Tissues yielding Gelatin. 



These belong to the principal ingredients of the 

 animal body, and do not occur in plants. In an organ- 

 ized form they constitute the cartilages, the tendons, the 

 ligaments, cellular tissue, serous membranes, the corium, 

 etc. All of these substances, entirely insoluble them- 

 selves in water, possess the property of becoming con- 

 verted, by continued boiling with water, into an appa- 

 rently isomeric substance, and of being dissolved for 

 the greater part as gelatin, the solution of which, on 

 cooling, forms a jelly-like mass. 



The elastic tissue, which forms the yellow bands of 

 the vertebral column, the ligamentum nuchse, the ex- 

 terior covering of the arteries, etc., does not suffer this 

 change in the slightest degree. 



The gelatin, which results from all these tissues, 

 differing in composition as well as structure, is of two 

 kinds, ordinary gelatin (glutin) and chondrin; and based 

 upon this, the fundamental substance of the tissues 

 has been divided into collagen and chondrigen. 



Glutin is produced from bone-cartilage, deer-horns, 

 fish-bones and fish-scales, the skin (corium), tendons, 

 serous membranes, isinglass. The solution, obtained 



