540 EXPERIMENT STATION RECORD. [Vol. 36 



Experimental notes on the bitter oak, E. Feeraei {Bol. Quind. Soc. Agr. 

 Ital., 21 {1916), No. 24, pp. 678-681).— The author calls attention to the im- 

 portance of securing data on the growth of Italian trees, and presents diameter, 

 height, and volume measurements of 22 bitter oak trees ranging in age from 39 

 to 97 years. 



Gutta-percha, B. H. F. Barnard {Agr. Bui. Fed. Malay States, 5 {1916), No. 

 2, pp. 25-31). — An account of gutta-percha-j'ielding trees with reference to their 

 botany, general distribution, and distribution in the Federated Malay States, 

 including also considerations relative to methods of extracting gutta-percha, 

 yield, cost of tapping, cultivation, improvement of natural gutta-percha forests, 

 and pests. Tabular data are given showing the yield of clean gutta from a 

 immber of trees that have been tapped four times during the period 1909 

 to 1915. 



DISEASES OF PLANTS. 



Laboratory outlines in plant pathology, H. H. Whetzel, L. R. Hesler, C. T. 

 Gregory, and W. H. Rankin {Ithaca, N. Y.: AutJiors, 1916, pp. 207). — The out- 

 lines given are those used at Cornell University, no attempt having been made 

 to adapt them for use at other institutions. Instructors are expected to select 

 materials suitable for their courses. The sequence of procedure is essentially 

 the same in all exercises, and its mastery should result in the student's ac- 

 quiring habits of orderly and logical investigation. The authors express the 

 hope that the groiiping of the diseases studied will direct attention from the 

 tiominance of systematic mycology and turn it to the more logical classification 

 and study of plant diseases based on pathological phenomena. 



Diseases of cultivated plants and trees, G. Massee {New York: The Mac- 

 millan Co., 1915, 2. ed., pp. XII+602+16, figs. i75).— The new matter contained 

 in this book is embraced in a supplement to the original edition (E. S. R., 24, p. 

 44). Descriptions are given of 20 or more diseases that have made their appear- 

 ance or assumed economic importance since the earlier publication. 



Report of committee on fung'us diseases, T. F. IManns {Trans. Peninsula 

 Hort. Soc. [Del.], 28 {1915), pp. 52-63).— This is a condensed account of insect 

 injury during 1914, also of plant diseases and of measures for their control, 

 including a plant disease survey, the results of which are discussed. 



Report of committee on fungus diseases, T. F. Manns {Trans. Peninsula 

 Hort. Soc. [Del.], 29 {1916), pp. 58-64)- — I^ike the above report for the previous 

 year, this deals partly with the prevalence, progress, and control of plant 

 diseases in other sections of the country, but more particularly with diseases 

 and contributing or opposing factors and results in and near Delaware. Some 

 prevalent diseases of the season are briefly reported on in connection with 

 the plants affected thereby. 



Cooperation in the investigation and control of plant diseases, K. F. Kel- 

 lerman {Ahs. in Mem. N. Y. Bot. Gard., 6 {1916), p. 517). — This is an argument 

 for closer cooperation between specialists studying plant diseases, on the one hand, 

 and Federal, State, and local ofllcials on the other, in order to secure quicker 

 diffusion of knowletlge regarding plant disea.ses and earlier and more effective 

 employment of agencies for their prevention or control. 



[Plant diseases in Barbados], J. R. Boa-ell and J. S. Dash {Rpt. Dept. Agr. 

 Barbados, 1914-15, pp. 20-25, ^3, 4^)- — This portion of the annual report in- 

 cludes, among other data presentetl and discussed, a tabular account of the 

 proportion of disease in the cotton hybrids under cultivation during 1910 to 1915 

 and a similar account of the prevalence of fungus diseases in cotton from the 



