FORESTRY. 445 



stock from which vigorous and productive plants may be grown. The author 

 suggests the possible use of such tubers in the production of bananas under a 

 system of rotation with other tropical crops. 



The general conclusion from the study of these tropical crop plants is in sub- 

 stance that the factor of branch dimorphism must be included in the scientific 

 study of their structure and habits, as well as in the breeding and adaptation 

 of varieties. Systems of cultivation and pruning must likewise be planned 

 with reference to the habits of branching. 



Banana experiments, St. Augustine estate, P. Carmody and J. McInroy 

 (Bui. Dept. Agr. Trinidad, 9 (1910), No. 66. pp. 201-215).— This is a report on 

 experiments in banana cultivation extending over a period of 4 years and in- 

 cluding the condition and treatment of the experimental plats, together with 

 the detailed receipts and expenditures. The results as a whole show that a 

 profit of $200 i3er acre may be expected from intensive cultivation of bananas 

 in Trinidad under present conditions and prices. 



The walnut, E. M. Price (Sacramento, Gal., 1910, pp. 68, pi 1, figs. 15). — A 

 concise treatise on walnut culture, based upon 20 years' experience in gi-owing- 

 walnuts in the California Sierras. 



The Greening pictorial system of landscape gardening, C. E. Greening 

 (Monroe, Mich., [1910], pp. 165, pi. 1, figs. 2'i6). — This work consists of over 

 200 photographic plates with descriptive reading matter attached portraying 

 various examples of landscape design. Descriptive notes are also given on 

 varieties of trees, shrubs, roses, etc., suitable for avenues, parks, and gardens. 



FORESTRY. 



The silva of California, W. L. Jepson (Mem. Univ. Cah, 2 (1910), pp. J,SO. 

 pis. 85, maps 3). — In this descriptive account the author has aimed to bring 

 together the present knowledge of the taxonomy and geographical distribution 

 of the timber trees of California. The results, based upon field studies and 

 collections made by the author during the last 19 years, dealing with the 

 dendrological characteristics of various species, their habits, architectural form, 

 seed reproduction, stump-sprouting, longevity, and relation to drought periods 

 are included, together with collected facts regarding nanism and spontaneous 

 hybrids, the behavior of trees attacked or mutilated by fire, animals, or man, 

 and some supplementary notes regarding the economic features of the species 

 especially in regard to wood characteristics. A short account of the " walnut- 

 oak hybrids" by E. B. Babcock (E. S. R., 24, p. 243) is also included. 



A 'list is given of the more important general reference works and a short 

 reference list is included under each species. Numerous photographic illus- 

 trations and drawings are appended. 



Studies on the comparative anatomy and morphology of coniferous roots, 

 with special reference to their systematic classification, W. Noelle (Bot. 

 Ztg., 1. AM., 68 (1910), No. 10-12, pp. 169-266, figs. 50).— The author first pre- 

 sents special studies of the root systems of Araucariacepe, Abietinese, Taxodiese, 

 and Cupressinese, on the basis of which a key has been prepared for the determi- 

 nation of the various species according to the structure of their root systems. A 

 general discussion is then given of the anatomy and morphology of coniferous 

 roots as a whole, including a discussion of the primary cortex, central cylinder, 

 secondary wood, secondary cortex, mycorrhiza, and heterorhizia. A bibliog- 

 raphy is appended. 



Moss cover and wood accretion, K. Bohmerle (Centbl. Gesam. Forstw., 36 

 (1910), No. 12, pp. 523-526). — In the litter experiments conducte<l in pine forests 

 for a number of yeai-s at the Mariabrunn Forestry Station (E. S. R., 18, p. 47), 



