OF BIRDS' BLOOD. 375 



from alcohol-ether the more characteristic rhombic tables 

 appeared. These crystals showed the characteristic color 

 reaction with chloroform and concentrated sulphuric acid, and 

 the absence of fats or fatty acids was demonstrated by the 

 fact that they melted at a temperature above 100 C. The 

 corpuscles of the sheep, dog, hen, and turkey were examined, 

 and cholesterin crystals obtained in every instance.* 



I desire to acknowledge the kind advice of Professor 

 Lafayette B. Mendel, at whose suggestion these experiments 

 were carried out. 



* Since the preceding account was sent for publication, a paper by 

 E. Hepner, " Ueber den Cholestearingehalt der Blutkorperchen," has appeared 

 in the Archiv f. d. ges. Physiol., 1899, Ixxiii, p. 595. The cholesterin-content 

 of the corpuscles of the dog and horse was determined ; free cholesterin was 

 also detected in the blood-plasma. 



