284 PHYSIOLOGICAL CHEMISTRY. 



figures referring to per cent amounts of the dry matter. Cells 

 from thymus of calf. 



Leuco-nuclein 68.79 



Albumins 1.76 



Histone 8.67 



Lecithin 7.51 



Fat 4.02 



Cholesterol 4.40 



Gtycogen 0.80 



In addition to these organic substances mineral matters are 

 present, with salts of potassium characteristic. 



Pus Cells. In their origin and characteristics these may 

 be considered as very similar to the leucocytes, if not indeed 

 identical with them. The few analyses made show a general 

 agreement when reduced to the same terms. It must be re- 

 membered that such analyses are far from simple operations, 

 especially in the separation of the several protein constituents. 

 The following figures by Hoppe-Seyler should be compared in 

 that light with the above. The numbers refer as before to the 

 dry matter: 



Nuclein and albumin 67.40 



Lecithin 7-56 



Fat 7-50 



Cholesterol .' 7.28 



Cerebrin and extractives 10.28 



The Spleen. While our knowledge of the functions of the 

 spleen is very imperfect a few words may be said in this con- 

 nection, since as far as is known the lymph glands in produc- 

 ing leucocytes do about the same kind of work. The one 

 thing most apparent about the spleen is that in this organ large 

 numbers of white cells are formed and given to the blood ; it 

 is also known that these cells suffer destruction there, as the 

 spleen pulp contains considerable quantities of the xanthine 

 bases, which are among the common products of cell nuclei 

 destruction. The cells so destroyed may possibly be those 

 which have already served their purpose in the blood as the 



