BLOOD-DISCS OF BIRDS AND REPTILES. 



205 



seen in the corpuscles of circulating or of freshly-drawn blood, 

 as it is in that of blood which has been drawn for some little 

 time ; and it is best brought into view by treating the blood 

 either with water or with acetic acid. The long diameter of 

 the oval discs of BIRDS (fig. 116) varies from about 1-1 7 00th 

 to 1 -2400th of an inch ; and the short diameter from about 



Fig. 117. BLOOD CORPUSCLES OF FROO. 



At A are seen the red corpuscles a, b, and the colourless corpuscle c ; at B, a red 

 corpuscle treated with acetic acid. 



l-300th to l-4800th. Thus the discs, though much longer than 

 those of Man, are not in general much broader. In REPTILES, 



Fig. 118. BLOOD CORPUSCLES OF PROTEUS. 



, b t red corpuscles ; a*, corpuscle showing the nucleus ; c, colourless corpuscle 

 d, red corpuscle treated with water. 



