L 



1918.] FOKESTKY. 643 



seasonal climatic variations, and it is impossible to say that any cultural 

 practice has affected the ammonifying power of the soil. 



" Tests show that nitrification varies with the season, but that a gi'owing 

 crop of grass or rye lowers the nitrate content of the soil ; that the most nitrates 

 are found under the clean culture-cover crop system, the straw mulch ranking 

 second in amount of nitrates ; that the girth gains of the trees are roughly 

 proportional to the nitrate content of the soil ; that there is no relation between 

 the nitrifying power of the soil and either cultural practices or tree growth ; 

 however, the ratio between the nitrates present in the field and the nitrifying 

 power of the soil does bear a relation to tree growth." 



Varieties and culture of cane fruits in western Washington, J. L. Stahl 

 {Washington Sta., West. Wash. Sta. Mo. Bui., 5 (1918), No. 10, pp. 1^-148).— 

 Popular instructions are given for the culture of raspberries, blackberries, and 

 loganberries, including descriptions of varieties adapted for culture in western 

 Washington. 



Shall I plant a garden this year? J. W. Lloyu {Illinois Sta. Circ. 209 

 {1918), pp. 4. ftd^- 2)- — This circular discusses the importance of planning a 

 home garden, gives a list of the station publications dealing with gardening, 

 and presents tentative plans for a suburban garden and a farmer's garden. 



Insecticides and fungicides, F. T. Shutt {Canada Expt. Farms Rpts. 1916, 

 pp. 169-173). — Analyses are given of samples of lime-sulphur, lead arsenate, 

 calcium arsenate, zinc arsenite, potassium cyanid, tobacco extracts, and a naph- 

 thalin preparation received for examination during the year. 



FORESTRY. 



Forestry and the war, B. E. Fernow {Jour. Forestry, 16 {1918), No. 2, pp. 

 149-154)- — A discussion of the relations of the war to forests and forestry, 

 with special reference to the development of future forest policies in America. 



An inventory of Florida's forests and the outlook for the future, R. M. 

 Hakpeb {Bien. Rpt. Dept. Agr. Fla., 14 {1915-16), pt. 2, pp. 194-213, figs. 12).— 

 An inventory of Florida's forests with reference to their area and density ; dis- 

 ti'ibution and character ; frequency of fire in different types ; composition, in- 

 cluding a list of the commonest species ; rate of growth and consumption ; and 

 influences affecting the future of the forests. 



Third biennial report of the State forester of the State of Colorado, W. J. 

 MoKBiLL {Bien. Rpt. State Forester Colo., 3 {1915-16), pp. 22, figs. 2).— A prog- 

 ress report on forest protection, investigation, and educational work, includ- 

 ing a financial statement for the two-year period ended November 30, 1916. 

 Recommendations relative to future activities are also included. 



Results for four years are given on a fence post treating project being con- 

 ducted in cooperation with the Forest Service of the U. S. Department of Agri- 

 culture. Posts of fire-killed alpine fir and lodgepole pine, and of Englemann 

 spruce, cut green and seasoned 12 months, were treated in different ways, 

 principally with water-gas tar creosote from the local gas plant in Fort Collins. 

 The results to date indicate in general that the open-tank method of treatment 

 is far superior to the brush method of treatment and has been highly satisfac- 

 tory in preserving posts. Immersion in hot water-gas tar for 1 hour and allow- 

 ing the posts to cool 1§ hours in the open tank gave as good results as immersing 

 the posts for 2 hours in the hot water-gas tar and allowing them to cool for 

 20 hours in the open tank. 



The present condition of plantings of some 51 species of trees on the Colo- 

 rado Agriculture College farm made in the spring of 1905 is indicated, together 

 with data on the present condition of plantings made at later dates with stock 



