OF THE BLOOD. 5 



resembling dew, of a watery nature, but affording a 

 nidorous smell, which is most remarkable in the blood 

 of carnivorous animals, peculiar and truly animal. 

 Much of this watery liquor still remains united with 

 the other parts of the blood. (B) 



8. In the mean time the blood, when its temperature 

 has fallen to about 78, begins to separate into two 

 portions. A coagulum is formed, from the surface of 

 which exudes, as it were, a fluid of a yellowish slightly 

 red colour, denominated serum: the more abundantly 

 this exudes, the greater is the contraction of the glu- 

 tinous coagulum, which has received the appellations 

 of crassamentum ; and, from some resemblance to the 

 liver in colour and texture, of hepar sanguineum; of 

 placenta ; and, from the circumstance of its being sur- 

 rounded by the serum, of insula. (C) 



9. The crassamentum may, by agitation or repeated 

 ablution, be easily separated into two constituent 

 parts the cruor, which imparted to the blood its 

 purple colour, and the lymph, which on washing is for- 

 saken by the cruor, and called, from its greater solidity, 

 the basis of the crassamentum. The stronger affinity 

 of the cruor for the lymph than for the serum, is proved 

 by the necessity of violence to effect their disunion. 

 By the removal of the cruor the lymph becomes gra- 

 dually paler, till it is at length merely a white tenacious 

 coagulum. (D) 



10. Besides the watery fluid first mentioned, these 

 are the three constituents of the blood, viz. the serum, 

 the cruor, and the lymph: we shall presently treat of 

 each more particularly. These, however, while recent, 

 and in possession of their native heat, are intimately 



