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observed sucking juices from fruit and flowers, etc. An extensive 

 series of experiments was undertaken by the author with a view to 

 determining, if possible, what property of blood is responsible for 

 ovulation and whether or no such property is present in some of the 

 ordinary substances in nature. For this purpose mosquitos were fed 

 with milk and sugar, peptone and sugar, and sugar only, with the 

 result that eggs were deposited from which adults in some cases were 

 reared, thus proving that deposition of eggs is possible without any 

 meal of blood. No results were however obtained as regards the 

 nature of the organic compound required, as legumin and sugar, 

 albumin and sugar, urea and sugar, and glucose only, gave negative 

 results. Incidentally it was also proved that an initial meal of blood 

 may sometimes suffice for as many as three batches of eggs, while a 

 single fertilisation suffices for several batches. 



Parker (R. R.). Seasonable Abundance of Flies in Montana. — Enfom. 

 News, Philadelphia, xxviii, no. 6, June 1917, pp. 278-282. 



Experiments conducted during July and August showed that the 

 house-fly reached its greatest abundance during the first three weeks 

 in August and showed an abrupt decrease during the fourth week ; 

 this decrease continued during September owing to the increasing cold. 

 For the same reason house-flies and other species were more abundant 

 in houses during September than in July and August. The total 

 number captured out of doors in beer-baited traps was made up of the 

 following species: — Musca domestica, 91 "8 per cent.; Muscina 

 stabulans, 3-61 per cent. ; Fannia scalaris, F., F. amicularis, L., and 

 an undetermined species, together, 2-38 per cent. ; Lucilia sericata,M.g., 

 1-51 per cent. ; and less than 1 per cent. , in all, of the following, Muscina 

 assimilis, Fall., Lucilia caesar, L., L. sylvarum, Mg., Phormia terrae- 

 novae, Desv., P. regina, Mg., Calliphora erythrocephala, Mg., 

 C. coloradensis, Hough, C. latifrons, Hough, Ophyra leucosloma, Wied., 

 undetermined Anthomyidae, Ravinia cotmnunis, Parker, R. peniculatay 

 Parker, Sarcophaga haemorrhoidalis, Fall., S. cooleyi, Parker, Boet- 

 tcheria cimbicis, Towns., Anacampta latiuscula, and Cidex tarsalis, Coq. 

 The comparative abundance of the house-fly may be expected to be 

 even greater in towns, but that of Fannia scalaris and blow-flies would 

 be less owing to systematic disposal of garbage. Blow-flies were most 

 abundant during the spring, especially Phormia terraenovae and a 

 species of Cynomyia, probably C. elongata, Hough, and these were 

 followed by Calliphora spp. A knowledge of the seasonal occurrence 

 of the blow- fly would be of value in connection with the blowing of 

 wool at lambing time, the species responsible for this trouble being 

 at present unknown. 



South Carolina Agric. Expt. Sta., Clemson College, S.C., Press Bulls, 

 nos. 93, 144, 147, 151. [n. d.]. [Received 29th June 1917.] 



The success of any method to control rats, whether by bait or traps, 

 depends on its simultaneous use in all parts of infested premises. The 

 best poisons are barytes, plaster of Paris and phosphorus. Each is 

 used by making a stiff dough with 1 part of the poison and 6 parts of 

 maizemeal or oatmeal. Rats may be driven from grain cribs or killed, 

 by fumigation with carbon bisulphide. 



