ECONOMIC ZOOLOdY ENTOMOLOGY. 645 



yatious curried on at the Nebraska Station failed to sliow tliat any decided 

 advantage accrued from tlie ai>i)lication of Bordeaux mixture. 



The appearance of the oak mildew in Sologne, E. Noffray {Jour. Agr. 

 Prat, n. ser.. 18 {1909), No. 28, pp. 81, ,S.^).— Attention is called to the reap- 

 pearance of the oalv mildew, attributed to Oidium qucrcinum, which has proved 

 quite destructive to young oalc trees, jiarticularly those grown in coi)pice, for 

 the last 2 or 3 years in parts of Europe. 



Tte so-called canker of poplar trees, P. Hoc (/'/or/. Agr. ct Vit. {Ed. VEst- 

 Centrc). SO (1909). Xo. SO, pp. 116-120).— \ A-ariety of Canada poplar, which is 

 extensively iilanted in parts of France on account of the rai)idity of its growth 

 and the quality of its wood, is said to be more or less subject to a canker 

 disease which is attributed to the action of bacteria. This disease is charac- 

 terized by the canker-liko growths formed upon the branches, in which the 

 wood and pith are destroyed. The change brought about in tliese tissues is not 

 limited to the canker spot but follows along the fibro-vascular bundles for a 

 considerable distance. A prominent swelling surrounds the canker which is 

 characterized by a depressed center which forms the canker ijroper. It is said 

 to be not uncommon that perfectly sound trees are found associated with those 

 that have been completely destroyed by the disease. 



It is suggested that where it is possible the affected branches should be cut 

 out and destroyed. If it is desired to replant, other varieties that are not 

 susceptible to the disease should be used. 



A disease of rose twigs {Dept. Agr. Trinidad, Bui. Agr. Inform., 1909, n. 

 ser., Xo. 63, p. 91 ) . — A brief account is given of a disease of rose twigs in which 

 the fruiting bodies of a species of Stilbella were found. The disease was shown 

 to be readily transmitted through inoculation experiments, and for its control 

 it is recommended that the diseased twigs be cut back and the bushes thoroughly 

 sprayed witli Bordeaux mixture or lime sulphur solution. 



Spraying calendar (Insert Pest and Plant Disease Bur. Xehr. Bid. 1, pp. 12, 

 figs. 2).— Formulas and directions for i)reparation are given for a number of 

 the more common fungicides and insecticides, and a tabular statement pre- 

 sented showing the times for application and the fungicides and insecticides to 

 be used for tlie principal insect and fungus pests of many economic plants. 



ECONOMIC ZOOLOGY— ENTOMOLOGY. 



Directory of officials and organizations concerned with the protection of 

 birds and game, 1909, T. S. Palmer {U. H. Dept. Agr., Bnr. liinl. Survey 

 Circ. 70, pp. 16). — This is the tenth annual directory of ofBcials and organiza- 

 tions concerned with the protection of birds and game in tlie United States and 

 Canada (E. S. E., 20. p. 4.55). The addresses are grouped under the headings 

 state oHicials. national organizations, state organizations, and Audubon societies. 



Annual review of investigations in general biology {Ann. Biol. [Paris], 

 11 {1909), pp. .\LlI+o08). — This volume contains abstracts of the most ini- 

 ])ortant articles published during l!»0(j relating to heretlity, variation, cellular 

 l)iology, origin of species, geographical distribution, and biological theories. 



The balance of nature, C. Abbey (London. 1909, pp. XLr+278, figs. 150).— 

 This is a practical manual iu which mammals, birds, and reptiles are considered. 

 Particular attention is given to methods of destruction, including trai)ping, 

 poisoning, etc. 



The rat problem. W. II. Boixtek (London. 1909. pp. VH+165, figs. 75).— 

 Chai)ters are i)resented on the natural history of the rat. the economic loss 

 caused by rats, the rnlc |ilaycd by tlic rat in the disseminatinn of disease, and 



