648 EXPERIMENT STATION BECOBD. [Vol. 35 



their use in the Northern and North Central States. Concise information is 

 given relative to the correct use of the more prominent species of trees, shrubs, 

 vines, and perennials in ornamental and landscape plantings. 



Ornamental gardening in Florida, C. T. Simpson {Little River, Fla.: Author, 

 1916, pp. XIII+198, pis. JfO, figs. 3).— A treatise on the decorative plants 

 adapted to Florida and their cultivation, with suggestions for the ornamentation 

 of Florida homes and grounds. 



FOEESTRY. 



Report of the Maryland State Board of Forestry for 1914 and 1915 {Rpt. 

 Md. State Bd. Forestry, 1914-15, pp. 77, j)ls. 7). — A report on forest activities 

 for the years 1914 and 1915 in which consideration is given to forest fire protec- 

 tion, assistance to owners of woodland, work on the state forest reserves and 

 the state forest nursery, forest and tree planting operations under state super- 

 vision, investigational and educational work, and public shade tree work. 



The Sequoia and General Grant National Parks, season of 1916 {U. S. 

 Dept. Int., Off. Sec. [Pub.], 1916, pp. 48, figs. S).— A pamphlet of information rela- 

 tive to the forests in these parks, methods of transportation, camp sites, birds, 

 mammals, and fishes occurring there, rules and regulations, and literature deal- 

 ing with the parks. See also a note by Hill (E. S. R., 35, p. 242). 



Tlie Mesa Verde National Park, season of 1916 {U. S. Dept. Int., Off. Sec. 

 [Pub.], 1916, pp. 48, figs. 5). — An account similar to the above relative to the 

 Mesa Verde National Park. 



Manual of instructions for county forest wardens and district forest 

 wardens and information in regard to the prevention and suppression of 

 forest fires, J. E. Bakton {Frankfort, Ky.: State, 1915, pp. SI). — Although de- 

 signed primarily for forest officers this manual contains considerable informa- 

 tion of value to the general public in the matter of controlling forest fires. 



Forest protection. — I, Protection against animals, R. Hess {Der Forst- 

 schutz. Erster Band: Scliutz gegen Tiere. Leipsic: B. G. Teubner, 1914, vol. 1, 

 4- ed., rev., pp. XIII -{-531, pis. 2, figs. 250). — A text-book, manual, and reference 

 work on forest protection. The present edition has been entirely rewritten by 

 R. Beck. The successive parts of the present volume deal in detail with pro- 

 tection against domestic animals, game, and other wild animals, birds, and 

 insects. 



Causes determining the forms of trees, P. Jaccaed {Rev. G6n. Bot., 27 

 {1915), Nos. 321, pp. 251-210, fig. 1; 325, pp. 335-349; 324, PP- 353-314, figs. 2).— 

 Recent experimental and mathematical investigations are said to have substan- 

 tially confirmed the conclusion formerly reached (E. S. R., 29, p. 342), and to 

 have shown that the forms of tree trunks, those of Picea excelsa in particular, 

 are directly influenced in essential characters, notably in the variations in thick- 

 ness of the layers of growth, by the exigencies of circulation of water and of 

 nutritive materials. See also a previous note (E. S. R., 34, p. 536). The ap- 

 plicability of the theory of the slow selection of useful variations in this con- 

 nection is denied. 



On the amount of sap discharged by some trees, M. Miyoshi {Jour. Col. 

 Sci. Imp. Univ. Tokyo, 38 {1916), Art. 1, pp. 14, figs. 4)- — Investigations con- 

 ducted by the author with two species of trees showing high sap pressure, 

 Cornus controversa and Carpinus yedoensis, led to the conclusion that it is im- 

 possible to secure accurate results relative to the discharge of sap for a longer 

 time than one bleeding period where the usual method of collecting the sap 

 from an auger hole is followed. A local stoppage in the hole is found to take 

 place inevitably, thus influencing the amount of sap flow. 



