206 
Degenerative Appearances in Protozoa 
were prepared from this mouse every half-hour and up to 7 hours after the 
injection of the drug. Mouse III. served as a control; blood-films were 
prepared at longer intervals in this case. All of the blood-films were 
stained intensely by Giemsa, i.e. for 2 hours at 25° C., and only the 
central part of the films was examined for the purpose of making the 
enumerations. 
After 5^—6 hours only a few parasites could be detected; they 
were gi’anular. After 6^- hours two parasites were detected, the one 
Showing the degeneration of Trypanosoma brucei consequent upon treatment of a mouse 
with arsenophenylglyein. Fig. 1, normal trypanosome. Figs. 2—3, parasites 2 hours 
after treatment. Fig. 4, a parasite 3 hours after treatment. Figs. 5—7, parasites and 
detritus 5 hours after treatment. After coloured figures from Giemsa-stained blood- 
films, drawn in the same manner as the figures in Diagram 1. 
