46 



metre of air, the best quantities were found to be sodium cyailide 

 30 gm., sulphuric acid 40 cc, and water 40-80 cc, but these vary with 

 the quaUty of the cyanide. About 10 per cent, of the theoretical 

 amount of HCN remains in the generating apparatus. Lice and their 

 eggs, placed in various parts of houses in test-tubes lightly plugged 

 with cotton wool, were used as indicators. The houses were divided 

 into classes according to the extent that they could be effectively 

 closed for fumigation, the gas used varying from |- volume per cent, 

 for 8-10 hours to 2 volumes per cent, for 3-6 hours. Where fumigation 

 was impracticable, all furniture, etc., was removed and disinfected, 

 the floor, walls, etc., being treated with a 5 per cent, solution of 

 creosote soap. The results were such as to demonstrate the efficacy 

 of these methods. 



Van Dine (D. L.) . The Destruction of A nophdes in screened Dwellings. 



— Southern Med. J I., Birmingham, Ala., xiv, no. 4, April 1921, 

 pp. 289-294. 



The figures of the number of female Anopheles qnadrimaculaiiis 

 captured within screened houses at Mound, Louisiana, are given for a 

 period of six years. A total of 578 was taken in 109 collections. The 

 conclusion reached is that under the conditions of this region, screening 

 does not give complete protection and that measures are required 

 against Anophelines that succeed in entering. Burning a few ounces 

 of pyrethrum in a screened house was found to drive the mosquitos 

 to the screens, where capture is easy. 



Parh.\m (J. C). Detection of Mosquito Larvae. — U.S. Naval Mai. 

 Bull., Washington, D.C., xv, no. 2, April 1921, p. 386. 



The value of a ladle in searching for mosquito larvae is enhanced 

 by another simple device in the form of a small hand-mirror. This is 

 useful in sunshine for searching for larvae in rain barrels, cisterns, etc., 

 as well as along edges of pools and in water-saturated grass-lands. 

 Larvae either at the surface or in deeper water are instantly detected 

 in the sunlight reflected on the surface of the water. An inspector 

 equipped with mirror and ladle can cover an area that would require 

 four inspectors not so equipped. 



PuNTONi (L.). Epidemia di Acariasi del Grano (da Pedicnloides ven- 

 tricosiis.) [An Epidemic of Grain Acariasis due to P. ventricosits.] 

 — ■// Policlinico, Rome, xxvii, no. 45, 8th November 1920, 

 pp. 1273-1275. 



Pantaleoni (P.). Vasta Epidemia di Acariasi da Grano in Romagna. 



FA big Epidemic of Grain Acariasis in the Roman Region.] — • 

 'ibidem, p. 1275. 



Descriptions are given of two epidemics of dermatitis due to the 

 Tarsonemid mite, Pedicnloides ventricosits, in Italy. 



PiLLERs (A. \Y. N.). Notes on Mange, and Allied, Mites for Veterin- 

 arians.— Z.o«rfo«, Bailhere, Tindall & Cox, 1921, xii-f 110 pp., 

 68 figs. [Price 12s. Qd. net.] 



In this handbook a good deal of information is collected regarding 

 mites that attack either animals or food, with notes on the beneficial 



