638 EXPERIMENT STATION RECORD. 



species of native trees and shrubs found in the forested mountains back of 

 Honolulu. 



Timber conditions in the Smoky River Valley and Grande-Prairie country, 

 J. A. DoucET (Dept. Int. Canada, Forestry Branth Bui. 53 (1915), pp. 55, figs. 

 20), — This comprises a report on forest conditions in the Smoky River Valley 

 and Grande-Prairie country, Canada. The survey, which covers an area of 

 over 9,500 square miles, was made in 1913 and continues and connects with 

 the survey work done in 1911 and 1912 (E. S. R., 31, p. 839). 



A handbook of forest protection {[Sacramento]: Cal. State Bd. Forestry, 

 1915. pp. 87, pi. 1). — A handbook of information relative to the forest policy of 

 California. It contains the forest laws of the State with interpretations of 

 certain sections, together \\\X\\ a synoi)sis of the game laws of the State and 

 the forest fire report for the year 1914. 



A discussion of log rules, their limitations and suggestions for correction. 

 H. E. McKenzie {Cal. Bd. Forestry Bui. 5 {1915), pp. 56, figs. 8). — In this 

 bulletin the author di.scusses many of the different log rules now in use, with 

 reference to the principles upon which they are based and wherein they are 

 defective. Relations are shown, where they exi.st, between different log rules 

 for the purpose of transforming data from one rule to another. 



The author also introduces a new log rule, based on mathematical principles, 

 and designed to be llexible to varying conditions, both in milling ojH'rations 

 and in the character of the timber to be sawe<l. 



What chemistry has done to aid the utilization of wood, S. F. Acree {Jour. 

 Indus, and Engin. Cliem., 7 {1915), No. 11, pp. 913-915). — In this paper the 

 author gives a popular discussion of the role of chemistry in the conversion of 

 waste wood into profitable by-products. 



DISEASES OF PLANTS. 



Effect of natural low temperature on certain fungi and bacteria, H. E. 

 Bartram {U. S. Dept. Agr., Jour. Agr. Research, 5 (1916), iS'o. 14, pp. 651- 

 655). — The author reports upon an investigation carried on at the Vermont 

 Experiment Station in which a number of tubes inoculated with different spe- 

 cies of fungi and bacteria were exposed during the winter to fluctuating tem- 

 peratures and tested in the spring of 1913 to determine the viability of the 

 various organisms. This experiment was repeate<l in 1913-14 with additional 

 species of organi.sms. the minimum temperature during the winter being 

 reportetl at —32° C. 



Tests were made of the vitality of the cultures on January 17, February 21, 

 and March 27, and it was found that in spite of the exposure to a low tempera- 

 ture Sclerotinia cinerea, CcphalotheHttni roseum, Glomerella rxifomaculans. 

 Venturia incqualis, and Ascochyta colorata lived through the winter imder all 

 conditions of exposure, while four others, Alternaria solani, Cylindrosporiuin 

 point, Ploicrightia morhoxa, and Phytophthora omnirora, lived over on some 

 media but not on others. Fusarium sp. from conifers was destroyed by the 

 low temperatures, while Collctotrirhum lindcinuthianum and Spharopsis 

 malorum were .so weakenetl that only untler very favorable conditions did 

 they respond to fresh media. Of six kinds of bacteria exposetl to the winter 

 temperatures, only two can be safely .«5aid to have surviviHl. Bacillus inclonis 

 and Actinomyces chromogenus. 



Simple technique for isolating single-spore strains of certain types of 

 fungi, r,. W. Kkitt (Phytopathology. 5 (1915), No. 5. pp. 266-269, fig. /).— 

 The author describes the media, instruments, and method i)ursued Ity himself 

 and others which are considered to be generally applicable to most fungi germi- 



