VAN Loon (F. H.). Pest en Pestbestrijiding. [Plague and Methods 



for combating Plague.]— i^o/o«. Inst., Amsterdam, Meded. no. 



xii (Afdeel. Trop. Hyg., no. 1), 1919, vii + 137 pp., illustrated. 



Price 3fl. [Received 2nd November 1921.] 



This volume, intended for medical men in the Dutch East Indies, 



is divided into two parts, one being clinical while the other describes 



remedial and preventive measures, including fumigation and the 



rat-proofing of dwellings. 



Bais (W. J.). Over Verbreiding en Bestrijding van eenige Ziekten 

 onder de Arbeiders in de Tropen. [The Occurrence and Control 

 of some Diseases among Labourers in the Tropics.] — Kolon. 

 Inst., Amsterdam, Meded. no. xiii (Afdeel. Trop. Hyg., no. 8), 1920, 

 137 pp., 5 figs., numerous maps and diagrams. Price 2fl.' 

 [Received 2nd November 1921.] 



Various points in the epidemiology and control of tropical diseases 

 are discussed in the light of experience gained from 1912 to 1919 on 

 the East Coast of Sumatra at an altitude of 1,300-1,600 feet. 



Malaria is endemic in the district, the Anophelines recorded being 

 Anopheles {Myzomyia) indefinitus, A. {M.) ptmctulatus, A. (M.) leuco- 

 sphyrus, A. hyrcanus (Myzorhynchus sinensis), and A. {Cellia) kochi. 

 A. leucosphyrus was the only species captured in a house where 

 several inmates had malignant tertian, and it is strongly suspected 

 of being the cause of all the epidemics. 



When, in July and August 1918, the rubber trees on an estate were 

 irrigated, both benign and malignant tertian infections occurred in the 

 hospital at the end of September. Though the drains were fihed in 

 within a 500-metre radius of the hospital, the number of Anophelines, 

 chiefly A. leucosphyrus, did not markedly decrease, and it was after- 

 wards found that this species can fly more than 800 metres from its 

 breeding place. Of individuals of A . leucosphyrus taken in dwellings 

 1 per cent, were infected with malaria, while of those taken in the 

 wards 4 per cent, were infected. Artificial infection experiments 

 with A. leucosphyrus and benign tertian malaria yielded an index 

 figure of 50 per cent. Though important, this is below that of 

 A. ludlowi (which was not recorded in the district), as this species has 

 an experimental infection index of 95-100 per cent, for malignant 

 tertian and 80 per cent, for benign tertian. 



A. leucosphyrus is a forest species, and the slow decline of malaria 

 up to and including 1917 was caused by the destruction of its breeding- 

 places as land was brought under cultivation. In 1918 there was an 

 artificial increase of breeding-places on the rubber estates, as mentioned 

 above, and this was supplemented by a prolonged rainy season. 

 Conditions again became unfavourable to A. leucosphyrus in 1919 

 owing to prolonged drought and to drainage, but there still remain 

 sufficient forest patches among the plantations to maintain it. 



VAN LoGHEM (J. J.). Vraagstukken der Indische Hygiene. [Dutch 

 East Indian Hygienic Questions.] — Kolon. Inst., Amsterdam, 

 Meded. no. xiv (Afdeel. Trop. Hyg., no. 9), 1920, viii + 159 pp. 

 Price 3fl. [Received 2nd November 1921.] 



In the section on malaria the great advance made in recent years 

 in the Dutch East Indies is referred to. A careful studv of local 



