60 PHYSIOLOGY. 



Carbon 52 parts; Oxygen 23 parts ; Hydrogen 7 parts; 

 Azote 15 parts. 



2l.{Fibrin is the basis of muscular fleshj and enters 

 largely into the formation of the blood, chyle, and lymph. It 

 is owing to the presence of fibrin that blood coagulates when 

 removed from the body. Fibrin is a solid, white substance, 

 of a fibrous structure, destitute of smell and taste, and in- 

 soluble in water. 



22. Fibrin may be obtained by washing the thick part of 

 the blood with cold water, and thus separating the colouring 

 matter, or the red globules/ It differs from albumen by 

 possessing the property of coagulating at all temperatures. 



jFibrin is composed of Carbon 43 parts ; Oxygen 19 parts ; 

 Hydrogen 7 parts; Azote 19 parts J It contains more azote 

 and less oxygen than albumen. 



23. Gelatine is found in none of the fluids of the human 

 *ody. lit is, however, found in nearly all the solids* It is 

 known from all the other animal principles/by its readily 

 dissolving in warm water, forming a kind of jelly) /When 

 dry, it forms a hard, shining, brittle substance, called glue. 

 This is mostly prepared^ from the skins and hoofs of animals, 

 by boiling them in water, and then evaporating the solution. 

 Isinglass is obtained from the sounds of the sturgeon, and is 

 a very T>ure gelatine. 



24. (Gelatine exists largely in the skin, cartilages, liga- 

 ments, tendons, and bones, and it forms the basis of the 

 cellular tissue/ As it does not exist in the blood, it is pro- 

 bably a modification of albumen. It is composed of Carbon 

 47 parts ; Oxygen 27 parts ; Hydrogen 7 parts ; Azote 16 

 parts. 



25. It appears that gelatine contains less carbon than 

 albumen, by 5 or 6 per cent., and a larger proportion of 

 oxygen in the same ratio. ftfow, if we suppose, that near 

 the skin, and in the various tissues of the body, the albumen 

 of the blood gives off a portion of its carbon, a part of which 



