644 EXPERIMENT STATION RECORD. 



top of the tree. Other points uoted in the study were the pathological forma- 

 tion of zones of contiguous resin ducts, especially at the boundary between two 

 annual rings, and a production of partial rings even over very small areas of 

 the meristematic sheath when the cambium is failing in activity. The hardness 

 of the timber seems to be inlependent of the percentage of autumn wood in the 

 annual rings. 



Some Douglas fir plantations. — I, Taymount plantation, Perthshire, F. 

 Scott {Jour. Bd. Agr. [London], 20 (lOJS), No. 5, pp. 402-Jfl 6) .—This planta- 

 tion, which was established in 18G0, is discussed with reference to its silvicul- 

 tural conditions and history, and estimates are given of timber volume, includ- 

 ing comparisons of volume measurements made in the past, quality of the timber, 

 and value of the plantation In 1912. 



Rubber experiments in Trinidad and Tobag-o, A. E. Collens (We.s-^ Indian 

 Bui., IS {1913), No. 3, pp. 219-235). — The work here summarized consists prin- 

 cipally of data on experimental tapping tests of a number of Hevea and Castilla 

 trees which have been introduced into Trinidad and Tobago from time to time. 



Rubber experiments in British Guiana, J. B. Haerison, F. A. Stockdale, 

 and S. H. Bayley {West Indian BtU., 13 {1913), No. 3, pp. 236-252, pis. 6).— 

 This comprises a review of tests which have been made with various kinds of 

 rubber-producing trees during the period 1908 to 1912. The subject matter is 

 discussed under the general headings of experiment station trials, estate 

 plantings, and miscellaneous investigations. 



The rubber tree book, VV. F. de B. Maclaren {London [1913], pp. ZFZ-f 

 S07, pis. 2, figs. 87). — This comprises a practical treatise on rubber culture, 

 including detailed information relative to the care and management of a rubber 

 plantation. 



Report on the wood-using' industries of Florida, H. Maxwell {Fla. Quart. 

 Bui. Agr. Dept., 23 {1913), No. 3, pp. 7-85). — A report on the wood-using indus- 

 tries of Florida, based on an investigation conducted by the Forest Service of 

 the U. S. Department of Agriculture in cooperation with the State. Data are 

 given showing the consumption and cost of native woods and other woods, both 

 by si^ecies and industries, together with brief descriptions of the various species 

 used. A large number of unused woods of Florida are also described, and sug- 

 gestions are given relative to the utilization of these woods. An abridgement 

 of the several census reports relative to the lumber cut and wood-using indus- 

 tries of Florida is appended, together with a list showing the various articles 

 manufactured from different species of wood and a directory of Florida wood- 

 using manufacturers. 



Cooperage, J. B. Wagner {Yonkers, N. Y., 1910, pp. XVII+396. figs. 113).— A 

 treatise on modern shop practice and methods, fi-oni the tree to the finished 

 article. 



DISEASES OF PLANTS. 



The vegetable parasites of cultivated or useful plants, T. Ferraris (/ 

 Parassiti Vegetali dclle Piante CoUivate od Utili. Alba, Italy, 1909. Nos. 1. pp. 

 1-80. figs. /,; 2, pp. 81-160, figs. 16; 3, pp. 161-240, figs. 17; 1910, Nos. 4, pp. 241- 

 S20, figs. 21; 5-6, pp. 321-480, pi. 1, figs. 42; 7, pp. 481-560, figs. 15; 1911, No. 8-9, 

 pp. 561-736, figs. 38; 1912, No. 10-12, pp. 737-944, fiffs. 31; 1913, [indexes], pp. 

 945-1032; pp. XII). — This work, prepared for use in schools of agriculture, 

 deals briefly with the nature of disease in plants ; the history of plant pathology ; 

 the origins, causes, and progress of plant diseases; surrounding conditions 

 favorable to the development of parasitic diseases; predisposition and the 

 influence of cultivation; resistance and immunity; heredity and disease; effects 



