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 dises of Brrps (fig. 116) varies from about 1-1700th 
to 1-2400th of an inch ; and the short diameter from about 
, Fig. 117.—Bioop Corrusctes oF Froc. 
At a areseen the red corpuscles a, 5, and the colourless corpuscle c; at B, a red 
corpuscle treated with acetic acid. 
1-300th to 1-4800th. Thus the discs, though much longer than 
those of Man, are not in general much broader. In REpPrmLEs, 
Fig. 118.—Bioop Corpusctes or Prorevs. 
 &, b, red corpuscles; a*, SS 6 colourless cotpuseie,; 
a ted corpuscle treated with 
