ECONOMIC ZOOLOGY ENTOMOLOGY. 151 



on sprayin.c: frnit tivi's, in which the senoral s^nhjoct of siirayinj; for the preven- 

 tion of plant diseases is discussed. 



Iron arsenate and copper fungicides, V. ^'ermoeei, and E. Dantony {Prog. 

 Agr. ct Vit. (Ed. rE.st-Cciilrc), JO (IDOD), No. J',, piK .',23, .'/^"/).— On account of 

 frequent requests for information repardini? the comhination of iron arsenate 

 witli copper fungicides to he used as a combined fungicide and insecticide, the 

 authors were led to investigate the suhject, and they state that the mixture is 

 not jiracticahle for several reasons. In the first place, the times of application 

 for the prevention of tlie principal insects and for mildew do not coincide. In 

 addition, the combination is decidedly destructive to foliage, particularly if an 

 alkaline arsenate is added to the sulphate of copper. In conclusion, the authors 

 state that the iron arsenate sliould be used alone and in no case combined with 

 copper. 



Some points in tlie preparation of Bordeaux mixture, W. Kelhofer 

 {Intermit. PJiijtopath. Diciist {Bcigabc Ztsehr. rflaiizenkrank.). 1 {IDOS), \n. 

 3, pp. 65-73, flgs. 7). — A study was made of some of the factors which must be 

 considex-ed in the preparation of B.ordeaux mixture of good quality. Among 

 these were the influence of the quality of the lime and copper sulphate, the 

 relative proportions in wliicli they are employed, the method of mixing the 

 solutions, aud the effect of the addition of sugar to secure greater adhesiveness. 



Within certain limits, the quality of the material was found to be of less 

 importance than the relative quantities used. In prejiaring Bordeaux mixture 

 it is recommended that the copi)er sulphate solution be slowly poured into the 

 lime mixture. A low temperature of the solutions was found to prevent the 

 rapid separation of the material, a temperature of about 15° C. being preferred 

 to one of 75°. A much slower precipitation was obtained when the copper 

 sulphate was poured into the lime than when the reverse process was followed. 

 The addition of sugar delayed precipitation on standing, and when stock solu- 

 tions are used it is essentially advantageous in delaying the separation of the 

 mixture. 



The increasing' of the stability of Bordeaux mixture through the addition 

 of sugar, W. Kelhofer (Landiv. Jalirh. Sctiicciz, 22 (IDOS), Xo. I'l, pp. SUO-863, 

 fig. 1). — A study was made of Bordeaux mixture to which vai-ying quantities 

 of sugar was added. The solution after preparation was placed in glass cylin- 

 ders and the amount of precipitate measured from day to day. It was found 

 that the rapidity of precipitation was greatly reduced by the addition of sugar. 



Analyses of some fungicides, W. Kelhofer {Laiulw. Jahrh, Scluveiz, 22 

 (190S), Xo. l.'f, pp. 870-87.'/). — Analyses are reported of a number of fungicides, 

 most of which are commercial preparations. Among them are Renommee, 

 ground sulphur, Sulfostite, nzurin. and Tuv. 



ECONOMIC ZOOLOGY— ENTOMOLOGY. 



Revision of the mice of the American genus Peromyscus, W. H. Osgood 

 {U. S. Dcpt. Agr:, Bur. Biol, tiurvcu, XortJi Aincricaii Fauna No. 28, pp. 285, 

 pis. S, figs. 12). — This work consists of a systematic study of the genus 

 I'eromyscus, which includes the so-calle^l wood mice, deer mice, vesper mice or 

 white-footed mice; keys for the identification of the various forms; and illus- 

 trations and maps which show the geographic distribution of the si)ecies. 



The mice of this group occur in great abundance throughout the United 

 States, ijarticularly in the Western States, but up to the present time the 

 interrelations and ranges of the various forms had not been worked out. More 

 than 27,000 specimens were examined in this woi'k. 



