EXPLANATION OF THE PLATES. 



separated from each other, the former being at its 

 origin rather large and without any defined margin : 

 it soon however shrinks in size, and assumes a 

 regular oval shape. Crescentic bodies, occasionally 

 met with in the blood of the frog, and probably of 

 vegetable nature, are also represented in the figure. 



Fig. 5. The red blood corpuscle of the adult frog, in different 

 stages of dissolution. In examining a drop of the 

 blood of a full-grown frog, a much greater uniformity 

 in the size of the red blood discs will be observed, 

 than exists in that of the very young animal, fewer 

 corpuscles being in process of development in the 

 former than in the latter. 



Fig. 6. Blood corpuscles of the adult frog united into chains, 

 an arrangement which appears to be intimately 

 connected with the coagulation of the fibrin. 



