63 



iiuule by six ditfeieut methods; all yieldtnl the same result. 

 Sulphur diuxide under pressure for two minutes kills with 

 certainty all stages in the cycle of development of the bug', 

 iiicludiug the effi;^. 



Blacklock (Dr. ]i.). The resistance of (hnit/tojojus nioiihata to 

 various sheep dips. — Ann. Tiop. Med. Paiaxit., vi, no. 4, 

 ;]i)th Dec. 1D12, pp. 429-4;W. 



Tiiese experiments were nuuh' witli the following' commercial 

 (lip.-: Cooper's, Little's, Savar's, Hayvv-ard's Yellow Paste, and 

 MacUoug-all's. Portions of the skin of goats were shaved, the 

 solution applied to the bare skin and allowed to dry before the 

 iicks were placed on it, and the effect noted. Thej' very fre- 

 quently failed to prevent Ornifhodorus nioiihaia from feeding' on 

 the animal. The ticks were allowed to feed on the shaved skin, 

 and whilst feeding they were thoroughly immersed in the dip 

 solution. The g-eneral result was that the soinier the di]) was 

 applied after the tick had begun to feed, the more likely was the 

 insect to loose its hold. 



The immersion of the ticks in solutions of the various dips, 

 even for periods of an hour and more, in many cases failed to 

 kill. In some cases they survived after very much long'er 

 immersion. The author arrives at the following- conclusions : — 



(1) The dips tested failed very frequently to prevent Ornitho- 

 doi-ns )noiibata feeding on the animal; (2) feeding ticks were not 

 easily caused to loosen their hold by them ; (3) in test-tube experi- 

 ments the resistance of this species of ti(dv to these siibstances in 

 solution is marked ; (4) used in the strength recommended and for 

 the time suggested these dips appear to have very slight effect 

 on this tick; (5) possibly other ticks behave in a different manuer 

 nnder these applications. 



Drainage against Malaria. — Bull, de F Association des Phnifcurs 

 dc Caoulr/ioiic, v. 1:3th March 1913, p. 52. 



Dr. Watson has invented a special system of sub-soil drainage 

 which results in the rapid extermination of hill mosquitos which 

 breed in running water. This system has been tried in the 

 Federated Malay States, on estates at Phillimore, and at Seafield, 

 and later in the neighbourhood of Kuala Lumpur. It is rei)orted 

 that in each case the results have been most satisfactory and well 

 repay the cost involved. 



Lit/ (Dr. A.). Contribugao para o estudo das Ceratopogoninas 

 hematofagas do Brazil. Primeira memoria. Parte geral. 



j ( 'ontribution to the study of tlie blood-sucking Cciatopo- 

 goninae of Brazil.] — Mew. Inst. Oswaldo Cruz, iv, \)i. 1, 

 1912, pp. 1-33. 



The author gives a general introductory account of the iiies 

 of the sub-family Ceeatopogoninae, and states that the blood- 

 sucking forms are well represented in Brazil. Certain species 



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