183 



number of insect carriers within a very restricted area. With this 

 purpose in view, mosquitos were collected from negro cabins on 

 plantations where the highest malarial index had been noted and 

 finally a more intensive plan was pursued : a group of eight cabins 

 was selected in which gamete bearers had been discovered the previous 

 autumn. A second blood examination, taken just prior to the mosquito 

 dissections, showed that at least six of the inhabitants still harboured 

 gametes. The six cabins yielded large numbers of Anopheles daily, 

 beginning 9th May ; a moderate number were taken on or near the 

 beds of the infected persons. More than 1,100 Anopheles were taken 

 from the six cabins and examined during a period of 20 days. No 

 parasites were seen until 15th May, when two A. quadrimaculatus were 

 found infected. From the therapeutic standpoint, at any time previous 

 to 15th May, in the locality investigated, protection from malaria 

 may be secured by treating with quinine all the human carriers ; 

 the insect carriers are thus prevented from carrying out their role in 

 completing the cycle. Failing this, prophylactic measures among 

 healthy and other susceptible persons may be instituted at any time 

 from 15th May to 1st June, when the completion of the mosquito- 

 cycle in this locality makes preventive measures urgent. 



Galewsky (— ). Vorschlage zur Entlausung von Gefangenenlagern. 



[Suggestions for freeing war prisoners' camps from lice.] — Deutsche 

 Medizinische Wochenschr., Berlin, xli, no. 22, 27th May 1915, 

 pp. 652-653. 



This paper describes experiments carried out in a prisoners' camp 

 at Konigsbruck with the object of ascertaining the cheapest and most 

 effective way of destroying lice in clothing and buildings. A building 

 used by Russian prisoners, nearly all of whom were infested with lice, 

 was selected for the first experiment. All cracks and corners were 

 washed with a 3 per cent, solution of cresol soap and were then filled 

 up. In this building, with a floor space of 450 square metres, 25 kilos 

 of sulphur were burnt in 16 sulphur stoves made on the principle of 

 the Bunsen burner and costing £15 only for the whole 16. The men's 

 clothing was hung up loosely, except in the case of two bundles of 

 shirts, which were tied up tightly. The burning was rapid, reaching 

 its maximum in 45 minutes. After a 3-hours interval, the doors and 

 windows were opened and two hours later the prisoners, who had had 

 a bath in the meantime, reoccupied it. Except in the two tightly 

 packed parcels, the lice and their eggs had been killed everywhere. 

 Sulphur fumes seem therefore to be effective against lice. 



Charleman (E.). Ktj Bonpocy o nmut cipeKoa-b. [On the question 

 of the food of dragon-flies.] — « JlwfiMTenb npMpOflbI.» [Friend of 

 Nature], Petrograd, no. 1, January 1915, pp. 14-15. 



During the large migrations of dragonflies {Libelhda quadrimacu- 

 lata, L.), which took place in the spring and summer 1914, they 

 destroyed many harmful insects, such as Simuliidae, Anopheles, 

 various small Lepidoptera and Anthomyid flies. 



