ECONOMIC ZOOLOGY ENTOMOLOGY. 163 



flcrits. Broods from infected miniatus ticks are not pathogenic and several 

 experiments conducted indicate that those from infected reflcxus adults are not. 

 Experiments with Dcrmaui/ssits ariiaii resulted negatively. 



From experiments with bedbugs which were transferred directly from in- 

 fected to uninfected hosts, in which different periods had elapsed before the 

 transfer, and in which the young of infected bugs w^ere used, the author con- 

 cludes that this insect does not transmit the spirochete of the European form 

 of recurrent fever. The spirochetes can live for a long time in the intestines 

 of bedbugs and may, however, occasionally be disseminated in this way. Trans- 

 mission experiments with A. rrflexus on rats gave only negative results. Atten- 

 tion is called to the fact that the studies of several authors have shown the body 

 louse to be the important agent in the transmission of 8. obernieicri. 



Fighting the insect pests and diseases of orchard, field, and garden crops, 

 H. L. Price {Virginia Sta. Circ. 7, rev., tip. 2-148, figs. 65). — ^A revised and 

 enlarged edition of this circular, previously noted (E. S. R., 21, p. 351). 



Insects associated with the cotton plant in Ceylon, E. E. Green {Trap, 

 Agr. and Mag. CvyJon Agr. Soc, 33 {1909), No. J/, pp. 318-321).— A brief account 

 of the more important species. 



Guide to the investigation of animal parasites of man and the doniestic 

 animals, M. Braun and M. Ltjhe (Lritfndcn ziir Untcrsuchung der Tierischen 

 Purasitcn de.^ Menschen und der Haustiere, Wilrzburg, 1909, pp. VII-\-186, figs. 

 100). — An account of the chief parasites of man and domesticated and other 

 animals. 



Lead arsenate, J. K. Haywood and C. C. McDonnell {U. 8. Dept. Agr., Bur. 

 Clieiii. Bill. 131, pp. /f9, pis. If, fig. 1). — Studies in cooperation with the Bureau 

 of Entomology, extending over a period of 2 years, and inaugurated principally 

 lor the purpose of determining the conditions which cause lead arsenate to be 

 injurious to foliage, are reported. 



Data obtained from the 18 manufacturers of the product in this country iu 

 1908 indicate that approximately 2,500 tons was sold during that year. The 

 first part of the bulletin relates to analyses made to determine the quality of 

 the leading arsenates as found on the market in different sections. The methods 

 of analyses are described, and the results reported in tabular form. 



As a considerable variation in moisture content was found, it is recommended 

 that the product be packed in air-tight packages and always bought in plainly 

 labeled original packages. In sever;; 1 of the samples examined, it was found 

 that the acetic acid had not been completly washed out. One of the samples 

 examined was lead arsenite and another was a mixture of the arsenate and 

 arsenite in about equal proportions. A great variation was found-in the com- 

 position of different samples. " The content of arsenic oxid ranges fi"om 6.03 

 to 43.81 per cent (the latter as As^Oa) ; lead oxid varies from 23.06 to 72.57 

 per cent; moisture from 0.41 to 61.84 per cent; water-soluble arsenic from 

 0.02 to 5.45 per cent (AsuO^) ; and water-soluble impurities from 0.08 to 7.54 

 per cent." When the determinations were calculated to moisture-free material 

 a much greater uniformity was found, but there was still a considerable varia- 

 tion. Arsenic oxid ran,ged from 10.30 to 44.70 ])er cent (the latter AsiiOi) ; lead 

 oxid from 49.58 to 77.93 per cent; water-soluble arsenic oxid from 0.03 to 5.56 

 per cent (AS2O3) ; and water-soluble impurities from 0.14 to 13.86 per cent. 

 " While some of the firms are making a good product, this can not be said 

 of all." 



The second i)art of the bulletin takes up homemade lead arsenate and the 

 chemicals entering into its manufacture, the methods of analysis, composition 

 of the chemic-al fornuilas, and directions for preparation, etc., being considered. 

 The third part reports experiments made to determine the action of lead 



