BLOOD. 



407 



From my own observations I am inclined 

 to think that the globules of the blood of the 

 frog have a mean long diameter of about 

 96i5gifi5ths of a line ; but the individual differences 

 observable among the several globules ranged 

 between 87-^^ and lOO^gths of a line. In the 

 blood of the water-newt (Salamandra cristata) 

 I have obtained in my measurements of the 

 long diameters of the globules the following ex- 



treme individual varieties: minimum 

 of a line, maximum 127- n5 ^ ro ths. 



The outline of the globules in all the verte- 

 brate animals is extremely well defined ; but 

 they are readily deformed or put out of shape. 

 Even during life their pressure mutually, or 

 the pressure they experience between the cur- 

 rents in which they move and the parietes of 

 the vessels against which they are driven, suf- 



