256 EXPERIMENT STATION RECOED. 



The author suggests that a practical application may be made of this Ijuowl- 

 edge through its affording a means of determining with some degree of accuracy 

 the proportion of flies in a given locality which find their breeding places in 

 horse manure. 



Vaporite as a means of destroying' subterranean insects, H. von Feilitzen 

 (Fiihli)ig's Landw. Ztg., 60 (1011), No. 5, j)p. 169-17Ii). — In field exi>eriments 

 conducted with larvre of the elaterid beetle Agriotcs lincatus and the cabbage 

 maggot {Phorhia [Anthomyia^'brassiccB) , vaporite proved ineffectual. In order 

 to test the direct action, 5 wireworms were placed in a small glass cylinder that 

 was filled with soil to a height of 20 cm., covered with 2 cm. of soil and above 

 this was placed 10 cm. of soil containing a large proportion of vaporite. All the 

 5 wireworms were alive after a 24 hours' exposure, while others on which 

 vaporite was placed were able to crawl away without showing signs of injury. 

 The author also finds that under certain conditions, namely, when used in large 

 quantities and poorly mixed, vaporite may injure the growth of cultivated 

 plants. 



The adhesion of insecticide mixtures of lead arsenate, H. Astruc, A. Cou- 

 VERGNE, and J. Mahoux {Compt. Rend,. Acad. Sci. [Paris], 152 (1911), No. 26, 

 pp. 1860-1862). — In order to determine the effect of age on the adhesiveness of 

 lead arsenate, the authors applied mixtures, prepared from 1 to 20 days pre- 

 vious, to plates of glass and to foliage. After drying for 24 hours the samples 

 on glass were exposed for i hour to a violent drenching in imitation of rain, 

 their surfaces being on an incline of 15 to 20° ; later they were exposed to the 

 washing of heavy rains. 



The tests led the authors to conclude that the age of a mixture of this insecti- 

 cide affects its adhesion to the vine but slightly. In general, when applied to 

 the vine, it was found that mixtures which had not been prepared for more 

 than 5 days were nearly equivalent in adhesiveness, whereas those which had 

 been prepared for from 10 to 20 days lost about one-fourth of the adhesive 

 property. 



Leakag'e of fumigation tents, C. W. Woodworth (Jour. Econ. Eni., If (1911), 

 No. Ji, pp. 376-380, pi. 1). — A discussion of the significance of the leakage factor 

 in fumigation, with a view to developing a dosage system based upon the vary- 

 ing conditions of leakage tents found in actual operations in the field. 



Pure insecticides, C. W. Woodworth (California Sta. Circ. 73, pp. 2).' — 

 This circular suggests terms for use in the more accurate specification of higli 

 grade insecticides. The California insecticide law permits any grade to be 

 sold, only requiring a statement of its composition and providing that it shall 

 not be lower than wthin 5 per cent of the percentage claimed on the label. A 

 list is given of chemicals and crude drugs already registered and the per- 

 centages claimed. 



Legislation in Canada in reference to injurious insects and plant diseases, 

 C. G. Hewitt (Jour. Econ. Ent., Jf (1911), No. >,, pp. 35S-362 ) .—The text of the 

 destructive insect and pest act of 1910, by which the Canadian Department of 

 Agriculture is empowered to take such action as may be deemed necessary to 

 prevent the introduction or spreading of injurious insects and plant diseases. 

 is presented, together with the regulations promulgated. 



[Establishment of a plant inspection service in France] (Jour. Off. Rrpuh. 

 Franc, JfS (1911), No. 130, pp. 3808. 3809; abs. in Intcrnat. Inst. Agr. [Rome], 

 Bui. Bur. Agr. Intel, and Plant Diseases, 2 (1911), No. 5, pp. 1198-1200).— On 

 May 1, 1911, the President of France issued the decree, here presented, estab- 

 lishing an inspection service consisting of entomological and phytopathological 

 sections. 



