108 



a large vacuole, and the other is bacilliform. In the cases observed 

 the infestation was shght, an average of 5-9 per mille red corpuscles 

 being infected. The infection is compatible with excellent health. 



Foley (H.). Microfilaires du chien dans le Sud-Oranais.— .4w«. Inst. 

 Pasteur, Paris, xxxv, no. ?>, March 1921, pp. 212-217, 1 plate. 



Dogs in the South Oran district of Algeria harbour two microfilaria. 

 Microfilaria immitis and another described here as M. anqnieri, sp. n. 



Bassett-Smith (P. W.). Trypanosomiasis. — //. Trop. Med. & Hyg., 

 London, xxiv, no. 8, 15th AprH 1921, pp. 105-108. 



The histor}^ of trypanosomiasis in man, mainly in Africa, is 

 reviewed. The question of immunity, especially among West African 

 natives, is discussed, and an account is given of the extermination 

 of Glossina palpalis on the Island of Principe [R.A.E., B, iv, 48]. 



Fisher (H. C). Report of the Health Department of the Panama 



Canal for the Calendar Year 1919.— il/o//H^ Hope, C. Z., 1920, 



134 pp., 20 plates. [Received 21st April 1921.] 



Climatic conditions were probably the cause of the variation in 



malarial incidence during the year in the Canal Zone, where the cases 



were more numerous during 1919 than they had been since 1915. 



Undrained swamps in the neighbourhood of Colon, Cristobal and 



Gatun gave rise to unusual swarms of Anopheles alhimanus and A. 



tarsimactdatus. A larvicide spray was used repeatedly as the easiest 



way of destroying the mosquitos covering the screens. The nearest 



breeding-ground was found to be nearly two miles away by direct 



flight, with about a mile of open water intervening. Considerable 



work has been already done in connection with the draining of 



swamps, and the plans for future action are discussed. 



In connection with the quarantine division of the Canal Zone, 

 provision is made for catching mosquitos on ships arriving from yellow 

 fever zones. Captures included Stegomyia fasciata (Aedes calopus) 

 from Colombia, and Anopheles alhimanus and Culex fatigans {qiiinque- 

 fasciaius) from Nicaragua. A continuation of intensive anti-mosquito 

 work, accompanied by regular monthly Stegomyia surveys as an index 

 of results, and a constant supervision of neighbouring ports, would 

 decrease the present danger and do much to eliminate the present 

 costly and annoying delays. During 1919, 80 vessels were delayed 

 in quarantine 173 days, and 15,839 passengers were detained for 



16,328 days. 

 The mosquitos sent for identification included : — Anopheles puncti- 



maada, A. alhimanus, A. tarsimaadatus, A. argyrotarsis, A. pseudo- 

 punctipennis, A. apidmacula, A. taeniorhynchus, three species of 



Haemagogus, Lutzia allostigma, Deinocerites melanophylhtm, D. pseiides, 



Taeniorhynchus {Mansonia) titillans, T. {M.) nigricans, T. (M.) 

 fasciolatus, Aedomyia squamipennis, Orthopodomyia fascipes, Psoro- 



phora posticata, Uranotaenia geometrica, U. lowi and U. typhlosomata. 

 Para-dichlorobenzene or camphor are advocated for preventing the 



breeding of the yellow fever mosquito {Stegomyia fasciata) [R.A.E., 



B, vih, 32.] 



Unremitting dihgence is exercised to keep the Canal Zone as free 



from flies as possible. Their breeding may be prevented by removing 



