SYXTOXIX: MYOSIX. 15 



soda, exists largely in milk, and forms one of its most im- 

 portant constituents. 



Syntonin is obtained from muscular tissue, both of the 

 striated and organic kind. It differs from ordinary fibrin 

 in several particulars, especially in being less soluble in 

 nitrate and carbonate of potash, and more soluble in dilute 

 hydrochloric acid. 



Myosin is the substance which spontaneously coagulates 

 in the juice of muscle. It is closely allied to syntonin ; 

 indeed, in the act of solution in dilute acid, it is converted 

 into it. 



The per-centage composition, of albumen, fibrin, gelatin, 

 and chondrin, is thus given by Mulder: 



Horny Matter. The substance of the horny tissues, in- 

 cluding the hair and nails (with whale-bone, hoofs, and 

 horns), consists of an albuminous substance, with larger 

 proportions of sulphur than albumen and fibrin contain. 

 Hair contains 10 per cent, and nails 6 to 8 per cent, of 

 sulphur. 



The horny substances, to which Simon applied the name 

 of keratin, are insoluble in water, alcohol, or ether ; soluble 

 in caustic alkalies, and sulphuric, nitric, and hydrochloric- 

 acids ; and not precipitable from the solution in acids by 

 ferrocyanide of potassium. 



Mucus, in some of its forms, is related to these horny 

 substances, consisting, in great part, of epithelium detached 



