540 EXPERIMENT STATION EECORD. [Vol.41 



every leaf and bud differentiation at an early stage in the development of the 

 flush. This differentiation was based upon differences in the crov^ns of the 

 growing tips. " Those of the fruit buds were rounded, with opposite pi'ojec- 

 tions below, that would develop into floral parts, while below these opposite 

 projections there were alternate projections that would mature into leaves. 

 The crowns of the leaf buds were conical, with only alternate projections below, 

 that would develop into leaves. The development of the different buds was 

 followed to the point where the evident^ gi-owth showed the crown differences to 

 be distinguishing characters." The study is to be continued. 



Citrus experiment grove, S. E. Collison {Florida Sta. Rpt. 1918, pp. 79-83). — 

 In continuation of previous reports (E. S. R., 39, p. 448) measurements are 

 given showing the increase in diameter of the trees of the various plats from 

 1909 to 1918, together with data showing a partial chemical analysis of leaves 

 and stems collected from the different plats. 



A study of the 24 poorer plats led to the conclusion that no particular source 

 of nitrogen can be singled out as having been injurious to vigor or amount of 

 growth, but that too much nitrogen is injurious to growth. An injurious effect 

 on growth was also produced by the use of ground limestone, and poor growth 

 resulted where kainit and Thomas slag were used on the trees. No definite 

 conclusions are thus far drawn as to the best fertilizer treatment. 



Analyses of leaves from the different plats showed that the figures for nitro- 

 gen, magnesia, iron, and phosphoric acid ran very close together. The average 

 percentage of lime was higher in the leaves from plats receiving lime, but the 

 higher lime content was not found in the stems. In plats receiving excessive 

 amounts of niti'ogen, the stems contained less nitrogen than the stems from the 

 remainder of the plats. No striking differences were observed in the leaves and 

 stejiis from the plat i-eceiving no fertilizer, except that they contained more 

 magnesia than leaves and stems from any of the other plats. 



Citrus growing in South Africa. — Oranges, lemons, naartjes, etc., R. A. 

 Davis {Pretoria: Dept. Ayr., 1919, pp. 66, pi. 1, figs. 45).— A practical treatise on 

 the culture, packing, and marketing of citrus fruits. 



Experiments in the culture, selection, and manuring of coconuts in Madras, 

 W. McRae anct R. D. Anstkad {Inst. Colon. Marseille, Bui. Mat. Grasses, No. 3 

 {1919), pp. 100-1 OS). — Notes on experiments conducted for several years at 

 Alleppi by G. H. Davey. 



The coconut in Cochin China, P. Mokange {Inst. Colon. Marseille, Bui. Mat. 

 Grasses, No. 3 {1919), pp. 89-94). — A brief report on the present status of and 

 future prospects for the coconut and copra industries in Cochin China. 



FORESTRY. 



Forest management, A. B. Recknagel and J. Bentley, jk. {New Yo}-k: John 

 Wileij d Sons, Inc., 1919, pp. XIII +269, pis. 4, flgs. 26).— A text-book and 

 treatise on forest management, the successive chapters cf which consider survey 

 of area, forest mensuration, log rules, instruments for forest measurements, the 

 measurement of felled trees, the measurement of standing trees, volume tables, 

 timber estimating, age of trees and stands, growth of individual trees, incre- 

 ment of stands, forest organization, regulation of the cut, the working plan 

 document, forest finance, and forest administration. An appendix contains 

 numerous related tables, outlines for forest description and planting plan, and 

 form for tree measurements. 



A National Forest policy, H. S. Graves {Amer. Forestry, 25 {1919), No. 308, 

 pp. 1281, 1282). — The author here presents some principles requiring the prac- 



