THE BLOOD. 



35 



Fig. 3. 



the latter. Their proportion appears to vary considerably in different parts of 

 the circulation, being much larger in the blood of the splenic vein and hepatic 

 vein than in other parts of the body, while in the splenic artery they are very 

 scanty. The colorless corpuscles bear a strong resemblance also to the cells 

 found in pus. 



From the fact that cells exactly like the colorless corpuscles are being con- 

 stantly furnished to the blood by the 

 ducts of the lymphatic glands, the 

 chyle-ducts (and even the liver in the 

 foetus), and also from their varying 

 proportion in different parts of the 

 circulation, and in different pathologi- 

 cal conditions, the colorless corpuscles 

 are usually regarded with, at any 

 rate, considerable probability as an 

 earlier stage of the colored blood- 

 disks. 



Fat-granules are seen in the blood 

 of the lower animals, and occasionally 

 in the blood of pregnant women ; also, according to Kolliker, in other persons 

 after the abundant use of milk or brandy, as well as in those who are fasting ; 



Fig 4. 



a. White corpuscles of human blood ; d. Red cor- 

 puscles. (High power.) 



Blood-crystals. A. Trihedral crystals from blood of guinea-pig. B. Pentagonal crystals from blood of 

 squirrel. C. Octahedral crystals from blood of rat and mouse. D. Haematin crystals from human blood. 

 E. Haematoidin crystals from an old apoplectic clot. F. Haemin crystals from blood treated with acetic acid. 



which he attributes, in the latter case, to the absorption of the fat of the body. 

 But, under ordinary circumstances, the granular base of the chyle, poured into 



