231 



647. TTROSIN. 



a. Acicular crystals. 



Note. Obtained from casein, horn, or cochineal, etc. See tt'att*' 

 Diet. Chem., vol. v., p. 930. 



648. EBTTHROSIN. 



a. Orange-red flakes. 



Note. Obtained by the action of nitric acid on tyrosin. See Ann. 

 Chem. et Pharm., vol. czvi., p. 87. 



649. GLTCOCHOLIC ACID. C 36 H 43 N O fl . 



a. White acicular crystals. 

 Note. Occurs in oxgall, combined with sodium or potassium. 



650. CHOLIC ACID. C^ H^ 6 . (Cholalic Acid.) 



a. White powder. 



Note. Obtained by the action of boiling solution of potassium hydrate 

 on glycocholic acid. 



651. TAUROCHOLIC ACID. C 26 H^ N S 7 . 



a. White powder. . 



Note. This acid is one of the constituents of oxgall. 



652. TAUEIN. 



a. In rather large transparent hexagonal prisms. 

 Note. Obtained by the action of boiling alkali or acid on taurocholir 

 acid. See Collection illustrating Crystallography, for some very perfect 

 crystals of this substance. 



653. PANCREATIN. (Pancreatic Oil, Pancreatic Fluid.) 



a. Oily fluid. 

 Note. This specimen was prepared by Professor Redwood. 



654. CREATING. C 4 H 9 N 3 2 , 2H 2 0. 



a. Prismatic crystals. 

 Note. Obtained from the juice of meat, etc. It is a neutral substance. 



655. CREATININE. C* H 7 N" 3 6. 



a. Prismatic crystals. 



Note. Obtained from creatine by the action of strong acids. It is a 

 strong base. 



