64 



the results obtained with oil-soaked sawdust offer great hopes for 

 ultimate mosquito control in rice-fields. 



Geiger (J. C), PuRDY (W. C.) & Tarbett (R. E.). Effective Malaria 

 Control in a Rice-field District, with Observations on Experimental 

 Mosquito Flights. — Jl. Med. Assoc, Chicago, III., Ixxii, no. 12, 

 22nd March 1919, pp. 844-847. 



In the Lonoke district, Arkansas, malaria has been checked by 

 sterilisation of carriers and anti-mosquito screening. The attempted 

 limitation of mosquito-breeding did not affect the presence of larvae 

 in the rice-fields. Anopheles quadrimaeiilatits being present in large 

 numbers about dwellings, in spite of the fact that all breeding was 

 confined to the iields. 



The following observation was made regarding the powers of flight 

 of A. quadritnacidatns. Two rice-fields about 1 ^q miles from Lonoke 

 were flooded on 25th May and 15-20 days later A. quadrimaculatus 

 appeared in the city. Circumstances pointed to these fields as being 

 the source. To check this observation flight experiments were made, 

 about 4,000 stained individuals being liberated. Only 10 were re- 

 captured. Of these 9 were recaptured at f of a mile from the starting 

 point, and 1 at a mile. 



Darnall (W. E.). New Jersey's Work in Mosquito Control. — 

 Jl. Amer. Med. Assoc, Chicago, III., Ixxiii, no. 10, 6th September 

 1919, pp. 737-742, 7 figs. 



This is a brief resume of the work done in New Jersey in combating 

 mosquitos. The area involved extends over 937 square miles with 

 a population of 2,188,063. The per capita cost is about 8f/. 



Gray (H. F.). The Cost of Malaria. A Study of Economic Loss 

 sustained by the Anderson-Cottonwood Irrigation District, Shasta 

 County, Calif. — Jl. Atner. Med. Assoc, Chicago, III, Ixxii, no. 21, 

 24th May 1920, pp. 1533-1535. 



The economic loss caused in this district in 1918 is due to a number of 

 factors, the three chief ones being medicine, medical service, and labour. 

 Others are due to inability to harvest crops at the proper time owing 

 to malarial attacks, losses on forced sales of property, and losses due 

 to depreciation of property values. At a conservative estimate the 

 last-named would be £50,000. 



If anti-malarial measures reduce malaria 50 per cent, in the first 

 year, 75 per cent, in the second, 90 per cent, in the third and 95 per 

 cent in the fourth (as experience in California has shown to be possible), 

 the cost of the three chief items will be saved and the others will show 

 a considerable profit. 



Owen (W. 0.). Illuminated Trap for Night Flying Insects. iVew 

 York Med. Jl, cix, no. 14, 5th April 1919, p. 590, 1 fig. 



This trap consists of a fruit jar with a layer of plaster of Paris and 

 potassium cyanide. In the bottom there is a small electric bulb 



