203 



which the temperature did not rise above 6° C. [42° R] the same 

 result occurred. At a temperature oscillating between 7° and 10° C. 

 [44°-50° F.] the mosquitos soon become torpid, but do not die for at 

 least 4 days. There is a very shght chance of life, unless the tem- 

 perature remains constant at over 6° C. [42° F.] and exposure is shorter 

 than G days. ^In view of the long voyage and the need for maintaining 

 a temperature beneath 6° C. there is no danger that infected Stegomyia 

 can be brought alive from ih.Q west coast of South America to the 

 Dutch East Indies. It is important that the temperature in the 

 storage chambers be carefully checked, and for this purpose a self- 

 registering thermometer is recommended. A thorough examination 

 of other parts of a vessel is very necessary. 



Plehn (A.). Zur Lehre von der Einheit der Malariaerreger. [The 

 Unitarian Theory of the Causal Agent of Malaria. ]—v4rc/i. /. 

 ScJiiffs.- u. Trop.-Hyg., Leijjsic, xxiv, no. 8, Se]:)tember 1920, pp. 

 225-227. 



This paper disputes the accuracy of Martini's criticism of the 

 unitarian theory [R.A.E., B, viii, 169]. 



Howard (L. 0.). Mosquitoes and Bsits.— Public Health Repts., 

 Washington, D.C., xxxv, no. 31, 30th July 1920, pp. 1789-1795. 

 The value of bats as destroyers of mosquitos in general, and in 

 particular the efficacy of bat roosts Hke those described elsewhere 

 [R.A.E., B, i, 176] are considered. Evidence is cited showing that 

 mosquitos do not form a large proportion of the diet of bats, that only 

 a very few species of bat are gregarious, and that no diminution of the 

 numbers of mosquitos or of the amount of malaria was observed in 

 places where bats were swarming, while as far as New Jersey and 

 Pennysylvania are concerned, no bat occurs that forms very large 

 colonies. Finally it is considered that bat roosts are not sufficiently 

 promising to justify the expenditure of public money on them. 



Green (H. H.) & Dijkman (C. D.). Some Experiments on the Fate of 

 Arsenic in the Animal Body.— Union of S. Africa Dep. Agric, 

 7th and 8fJi Repts. Direct. Vet. Res., April 1918, Capetown, 

 1920, pp. 689-698. 



As the result of a number of experiments on the fate of arsenic in 

 the animal body, it was found that the amount of arsenic eliminated 

 by the kidneys after dipping and the amount retained in the skin 

 and hair of dipped animals seem to have been greatly overestimated 

 by previous workers. Experiments in oral dosing and intravenous 

 injection were made in order to trace the methods of elimination in 

 various animals, and to find the distribution of arsenic in the tissues 

 and the amount of the toxic dose. 



Green (H. H.) & Kestell (N. H.). Behaviour of Bacteria towards 

 Arsenic— f/n/ow of S. Africa Dept. Agric., 7th and 8th Repts. 

 Direct. Vet. Res., April 1918, Cape Town, 1920, pp. 701-706. 



In the experiments here described, although over a dozen different 

 species of arsenic-resistant bacteria were examined, only two showed 



