102 THE CHEMISTRY OF THE TISSUES AND ORGANS. 



as 0'027 to 0'07. On the other hand, it must be stated that such 

 an experienced chemist as Nencki 1 is still unable to discover any 

 urea in muscle. 



Taurine is found in the muscles of horses, fishes, and molluscs. In 

 fishes Limpricht 2 found T06 per cent. 



G-lycocine is found to the extent of O39 to 0'71 per cent, in the non- 

 striated muscles of molluscs. 3 



Protic acid is an acid of doubtful nature, described by Limpricht in 

 fishes' muscles. 



Inosinic acid (C 10 H 14 N 4 O n ) was first described by Liebig, and 



FIG. 16. Spherical compound of mercury and creatine. 

 After G. S. Johnson. 



estimated (0'005 to 0'02 per cent.) by Creite. 4 According to Frankel, 5 

 it is closely related to carnic acid, to be immediately described. 



Lecithin and its decomposition products are present in small 

 quantities, and are probably derived from the nerves supplying the 

 muscle. 6 Small quantities of cholesterin are found as well. 



Carnic acid (Meischsdure) is the name given by Siegfried 7 to a con- 

 stituent of muscle, the discovery of which is of great importance. He 

 first prepared it from muscle extracts by means of ferric chloride ; the 

 compound so obtained is called carnifcrrin ; this contains phosphorus as 



1 Nencki and Kowaski, Arch. f. exper. Path. n. PharmaJcol., Leipzig, 1895, Bd. xxxvi. 

 S. 395. 



2 Ann. d. C%em., Leipzig, Bd. cxxvii. S. 185 ; cxxxiii. S. 300. 



3 Chittenden, ibid., Bd. clxxviii. S. 266. 



* Ztsclir.f. rat. Med., Leipzig, Bd. xxxvi. S. 195. 



5 " Zur Kenntniss der Zerfallproducte des Eiweisses," Wien, 1896. 



6 Hoppe-Seyler, "Physiol. Chem.," S. 647. 



7 JBer. d. deutsch. chem. Gesellsch., Berlin, 1894, Bd. xxvii. S. 2762 ; Ztsclir. f. physiol. 

 Chem., Strassbnrg, Bd. xxi. S. 360. 



