410 



THE CANADIAN NATURALIST. 



[Vol. X. 



the kidney of the frog;. Within the cells they can best be seen 

 on the addition of salt solution 3%. T have found, after trying 

 a number of solutions, that Pilocarpin ^% brings them out 

 very clearly. In one frog the red corpuscles contained, in addi- 

 tion to the Drepanidia, smaller irregular masses, fig 4. 



In blood fiom a small frog they were very abundant, and could 

 be seen well without any re.igent. Fig. 5 a represents a cor- 

 puscle with one inside wliich travelled round the cell four or 

 five times, and then migrated from it as shown at Figs. 5 b 

 and c. This curious phenomenon was witnessed several times, 

 and did not seem to injure the corpuscles very much, some pre- 

 senting no trace of the point of exit, others a slight depression. 



