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TRANSMISSION OF PARASITES

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the disease-producing trypanosomes. It is to be noted that the trypanosome at intervals, not as yet

Fig. 47.—General view of digestive tract of Glossina palpalis. (After Minchin, Report on Sleeping Sickness to the Royal Society.)

Ph., pharynx; Œs., œsophagus; C. s. d., common salivary duct; S. d., salivary ducts; Pro., proventriculus; Th. in. thoracic intestine; S. st., sucking stomach; S. g., salivary glands; Abd. in., abdominal intestine; R., rectum; R. amp., rectal ampulla.

ascertained, is incapable of infecting the fly. For this observation also we are indebted to Miss M. Robertson.

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