848 EXPEBIMENT STATION RECOED. 



The curve for any stage of any insect at constant temperatures can be platted 

 by the establishment experimentally of anj' two points, or, if the develop- 

 mental zero be known, by the establishment of any one point. 



" The foregoing conclusions are primarily for constant temperature condi- 

 tions. While we have less proof, the data seem to show that for temperatures 

 showing a daily variation the effective temperature is somewhat higher than 

 the daily mean. On the other hand, when the change is not in the nature of a 

 daily variation, but rather a change of constant temperatures for longer pe- 

 riods of time we find that the results work out properly for the original hyper- 

 bolic curve. . . . 



" Finally, it must be borne in mind that all temperature factors and calcu- 

 lations involving them must be based on degrees above the developmental zero. 

 This may be seen in the calculation of the thermal constant." 



Utilization of certain phytophagous insects in combating the enemies of 

 cultivated plants, A. Vuillet (Rev. Sci. [Paris], 52 {1914), I, No. 17, pp. 526- 

 530; abs. in Rev. Appl. Ent., 2 {1914), Ser. A, No. 6, p. 345).— A general dis- 

 cussion. 



Some attempts to control injurious insects by means of their natural 

 enemies, T. A. C. Schoevers {Tijdschr. Plantenziekten, 19 {1913), Nos. 8, pp. 

 91-96; 4, pp. 109-180; at>s. in Rev. Appl. Ent., 1 {1913), Ser. A, No. 10, p. 376).— 

 A discussion of the subject with a summary of experimental work. 



Proceedings of the Entomological Society of British Columbia {Proc. Ent. 

 8oc. Brit. CohimMa, n. ser.. No. 8 {1913), pp. 46)- — ^Among the more important 

 papers here presented are Combination Sprays and Recent Insecticide Investi- 

 gations, by H. F. Wilson (pp. 9-17) ; Methods of Taking Insect Records in the 

 Field, by R. C. Treherne (pp. 21-24) ; Some Problems in Aphis Control, by L. L. 

 Palmer (pp. 31-34) ; Two Injurious Insects of Economic Importance Attacking 

 Peach, Apricot, and Plum Trees, namely, the peach twig moth and the peach 

 borer, by W. H. Lyne (pp. 34-36) ; Cutworms and Their Control, by M. S. 

 Middleton (pp. 36, 37) ; and The Economic Importance of Canadian Ipidse, by 

 J. M. Swaine (pp. 41-i3). 



Phytopathological report for the year 1913, P. Maechal {Rei\ Phytopath. 

 Appl, 1 {1914), No 18-19, pp. 9-13; al)S. in Rev. Appl. Ent., 2 {1914), Ser. A, No. 

 7, pp. 420-422) .—This annual report (E. S. R., 30, p. 154) deals with the more 

 important insects of the year. 



Eecent work of the Koyal Entomological Station of Hungary, J. Jablonow- 

 SKY {Internat. Inst. Agr. [Rome], Mo. Bui. Agr. Intel, and Plant Diseases, 

 5 {1914), No. 3, pp. 316-320). — This is a discussion of work with control meas- 

 ures for insect pests and rodents, which was carried on during 1913, 



[Observations on the insect enemies of field crops and orchards during 

 1913], V. V. DoBEOVLiANSKY {Khoz{histvo, 1914, No. 10, pp. 332-338; abs. in 

 Rev. Appl. Ent., 2 {1914), Ser. A, No. 6, pp. 341-343) .—This is a report of work 

 conducted at the Kief Station during 1913. 



The insect enemies and diseases of plants in the Government of Taurida 

 during 1913, I. M. Shtchegolev {Otchet Di^tateln. Pomoshch. Oubern. Ent. 

 [Taurida] Zemstva, 1913, pp. 24; abs. in Rev. Appl. Ent., 2 {1914), Ser. A, No. 5, 

 pp. 329-331). — Among the pests mentioned as causing damage to plants during 

 the year are the gipsy moth, Eoplocampa brevis, Anthonomus pomorum, the 

 codling moth, Eriocampa adumbrata, Luperus ruflpes, Choreutis parialis, etc. 



Preliminary studies of the enemies of clover, G. del Guercio {Atti R. Accad. 

 Econ. Agr. Oeorg. Firenze, 5. ser., 11 {1914), No. 2, pp. 133-183, figs. 39).— The 

 more important Insect enemies of Trifolium here discussed are the aphidids 

 Rizoberlesia trifolii and Aphis scaliw n. sp., Apion spp.. and the clover root 

 borer, Hylastes trifolii. 



