53 



King (W. V.). The R6Ie of Anopheles punctipsnnis, Say, in the trans- 

 mission of Malaria. — Science, Lancaster, Pa., xlii, no. 1094, 17tli 

 December 1915, pp. 873-874. 



As the result of recent experiments conducted in New Orleans, 

 Louisiana, it has been proved that Anopheles punctipennis is an 

 efficient medium for the development of the sexual cycle of Plasmodium 

 vivax, the organism of tertian malaria. A. punctipennis is common 

 in the United States and owing to its abundance and wide distribution, 

 the question of its agency in the spread of malaria is important. The 

 fact that A. punctipennis is a host of tertian malaria does not necessarily 

 indicate that it is an efficient carrier of other forms of malaria. Previous 

 experiments by Hirschberg suggest that this is not the case. 



Kaupp (B. F.). Some Experiments with Agents calculated to kill the 



Tromhidium holosericeum. — Science, Lancaster, Pa., xliii, no. 1097, 

 7th January 1916, pp. 33-35. 



Tromhidium holosericeum (common fowl mite) occurs throughout 

 the United States. It is very troublesome during July and August, 

 when conditions are favourable for rapid multiplication. The effect 

 of certain insecticides, including sulphur, Paris green, naphthaline, 

 carbolic acid, etc., upon the mites was tested. Powdered sulphur, 

 air-slaked lime, and Paris green, in the dry state, had no efiect on the 

 mites. Naphthaline, or powdered moth balls, killed all mites in 

 45 minutes, by virtue of the volatile substances emitted. Insect 

 powder containing gasoline and crude carbolic acid killed the mites 

 in 1 minute. Solutions sufficiently concentrated killed in the following 

 lengths of time : Crude carbolic acid, 20 seconds ; 5 per cent, carbolic 

 acid, 1 minute ; 1 per cent, naphthaline in kerosene, 30 seconds ; 

 1 per cent, kreso dip, 10 minutes, and 2 per cent., 4 minutes ; 10 per 

 cent, formaldehyde, 10 minutes. The substances used, to be effective, 

 must be in solution or be capable of giving ofi volatile substances 

 which are themselves destructive. 



Noel (P.). Les mouches, les moustiques, les poux et les rats dans les 

 tranch6es. [Flies, mosquitos, lice and rats in the trenches.] — 

 BuU. Trim. Lab. Entom. Agric. Seine Infer., Rouen, January- 

 February-March 1916, pp. 9-15. 



Dr. Loir, chief of the Service d'Hygiene at Havre, recommends the 

 following preventive against body lice : — One part each of naph- 

 thaline and camphor with sufficient benzine to render them miscible, 

 mixed with sawdust, 3 parts by weight. This mixture is placed in 

 small, flat sachets measuring 1| by 2j inches, which are worn next 

 the skin. 



A Good Fly Glue. — Queensland Agric. Jl., Brisbane, iv, no. 6. 

 December 1915. p. 352. 



The following mixtures are recommended for trapping flies :• — 

 (1) 6 parts colophony, 4 parts rape -seed oil, and 3 parts resin, melted 

 together ; (2) 8 parts resin, 4 parts each of turpentine and rape-seed 

 oil, and | part honey ; (3) 1 lb. resin, 3 oz. each of molasses and 

 linseed oil, boiled together to form a thick paste. 



(C254) Wt.Pl/106. 1,500. 4.16. B.&F.Ltd. Gp.11/3. 



