518 Col. Sir D. Bruce and others. Development of [Feb. 15, 
ILLUSTRATIONS OF VARIOUS MODIFICATIONS IN SHAPE OF TRYPANOSOMA 
GAMBIENSE IN GLOSSINA PALPALIS. 
Fies. 1—3.—Normal blood parasites (Trypanosoma gambiense). 
Fic. 4.—24 hours after ingestion by the fly. ? 
Fias. 5 and 6.—48 hours after ingestion by the fly. 
Fie. 7.—96 hours after ingestion by the fly. 
Figs. 1—7 represent the trypanosomes as they appear in the intestine of Glossina 
palpalis during the first few days. Figs. 1—3 are ordinary blood forms, as seen 
immediately after the fly has fed, and before any change has taken place. Figs. 4—7 
represent the process of degeneration which takes place during the first four days. The 
body swells up, the nucleus breaks up, and the cytoplasm becomes vacuolated. 
X 2000. 
Fic. 8.—Trypanosoma gambiense from fore-gut, 8 days after infected feed. 
Fie. 9.—T. gambiense from proventriculus, 14 days after infected feed. 
Fic. 10.—T7. gambiense from fore-gut, 18 days after infected feed. 
Fig. 11.—T7. gambiense from mid-gut, 25 days after infected feed. 
Fie. 12.—T. gambiense from mid-gut, 34 days after infected feed. 
Fie. 13.—T. gambiense from fore-gut, 44 days after infected feed. 
