ECONOMIC ZOOLOGY ENTOMOLOGY. 455 



44.05 per ceut. The percentage of soluble arsenic was low in all samples. The 

 impurities" were partly nitrates, but were not determined more accurately. At 

 tlio usual market iiricos lead arsenate is cheaper than Paris green. 



In sami)les of Paris green the amount of arsenious oxid ranged from 50.2 to 

 VA.V.) i)er cent, and cupric oxid from 25.56 to 30.27 per ceut. Most of the sam- 

 ples contained too much soluble arsenic. 



Direc'tions were given for the preparation and use of lead arsenate and Paris 

 green. 



Pyrethrum powder, A. L. IIerrera (Com. Par. Agr. [Mexico'], Circ. 61, pp. 

 2.'i, pis. 0). — A botanical discussion is given on the plants from which pyrethrum 

 powder is made. The uses of this powder in the control of various insect pests 

 are also mentioned. The methods of preparation of pyrethrum powder are de- 

 scribed and notes are given on its chemical composition. 



Spray materials, C. L. Penny {Delaware Sta. Rpfs. WOj-l'DOG, pp. 3), 35). ~ 

 It was observed that carbon dioxid decomposes lime-sulphur-salt wash setting 

 free sulphureted hydrogen and sulphur. It is doubtful, however, whether in 

 case this gas is compressed in a power-spraying apparatus a sufficient length of 

 time will be given for it to act disastrously upon the composition of the in- 

 secticide. 



Proceedings of the nineteenth annual meeting of the Association of 

 Economic Entomologists (C7. iS'. Deyt. Agr., Bur. Ent. Bui. 67, pp. I.'i5, pi. I, 

 pgs. 7). — The nineteenth annual meeting of the Association of Economic Ento- 

 mologists was held at Columbia University, New York City, December 28, 29, 

 1900. At this meeting a number of papers on entomological topics were pre- 

 sented, together with reports of committees on nomenclature, cooperative test- 

 ing of insecticides, and National control of introduced insect pests. As at previ- 

 ous meetings of the association, several short papers were presented dealing 

 with the biological and economic aspects of the more important insect pests of 

 the year. Such accounts were presented for Minnesota by F. L. Washburn, for 

 New .Jersey by J. B. Smith, for Maryland by A. B. Gahan and G. P. Weldon, for 

 New York by E. P. Felt, for Georgia by R. I. Smith, for the Philippines by C. S. 

 Banks, and for Central Alberta by P. B. Gregson. 



The Occurrence of the Gipsy Moth in Connecticut was discussed by W. E. 

 Kritton (pp. 22-20). The work of eradication has progressed satisfactorily and 

 it is now difficult to find any indication of the gipsy moth. W. J. Schoene re- 

 l>orted the willow borer as very destructive to nursery plantations of poplar 

 and willow (pp. 27, 28). Some benefit was derived from the use of arsenical 

 sprays. Aphis eggs, particularly those of species which occur on apples, are 

 nearly all destroyed by spraying with sulphur wash or crude oil, according to 

 experiments by H. E. Hodgkiss (pp. 29, 30). Accounts were also presented on 

 the manner of birth of the woolly aphis, by W. E. Rumsey (pp. 31-33) ; of injury 

 by the pear blister mite to apple leaves, by P. J. Parrott (pp. 43—16) ; and of the 

 natural enemies of the cottony maple scale, by E. L. Dickerson (pp. 48-52). 



The different methods used in estimating the benefit of spraying for codling 

 moth were discu.ssed by A. F. Burgess (pp. 53-55). E. D. Ball presented a i)aper 

 on The C(mtrol of the Codling Moth in the Arid Regions (j)p. .5,5-75). The cod- 

 ling moth in Utah has been shown to be definitely two-brooded. It is so abun- 

 dant as to require 5 to 8 insecticide applications. Moi'e than two-thirds of the 

 first brood and nearly two-thirds of the second brood of larvae enter the calyx 

 and about 98 per cent of these larvio were destroyed by two early applications. 



Suggestions regarding suitable subjects for entomological research under the 

 Adams Act were made by E. D. Sanderson (pp. 77-84). B. H. Walden reported 

 a new sawfly (PamphiUus pemicum) as injurious to peach leaves (pp. 85, 86). 



21767—08 5 



