HORTICULTURE. 439 



After thirteen years of continuous manurlal treatment along tlie same lines, 

 it appears that under conditions prevailing at the Botanic Gardens a steady 

 annual yield of from 1,100 to 1,200 lbs. of cured cacao can be obtained without 

 the use of manures. Experience has shown, however, that cacao trees grown 

 in this way are susceptible to the attacks of fungus diseases, v.hich are very 

 difficult to combat. The mulched plat continues to yield higher than any of 

 tlie other plats and for the current year gave 1,947 lbs. of cured cacao per acre, 

 or 779 lbs. more than the control plat. The vigor and general appearance of 

 the trees, in spite of the heavy yields, is very striking. Mulching costs approxi- 

 mately 80 shillings ($19.20) per acre. 



The experiments with limes which were started in 1913 have given no con- 

 clusive results thus far. Judging from the appearance of the trees the out- 

 standing feature is the excellent growth made by the complete manure plat, 

 and the slow but steady improvement in the condition of the mulched plat. 



Coconut culture, J. R. Johnston (Estac. Expt. Agron. Cuba Circ. 49 {1015), 

 pp. 11, pis. 3). — A practical treatise on coconut culture, discussing soils, selection 

 of seed, varieties, propagation, planting, cultivation, fertilizers, companion 

 crops, harvesting yield, diseases, and insect pests. 



Flowering' plants for St. Louis {Missouri Bot. Gard, Bui., 3 {1915), Nos. 9, 

 pp. 117-121; 10, pp. 126-134; 11, pp. 141-151) .—This comprises a descriptive 

 list of trees, shrubs, perennials, and annuals, prepared under the direction of 

 the Missouri Botanical Garden, as suitable for culture in the latitude of St. 

 Louis. 



Hardy roses: Their culture in Canada, W. T. Macoun and F. E. Buck 

 {Canada Expt. Farms Bui. 85 {1915), pp. 39, figs. 15). — As a result of experi- 

 mental tests with roses extending from Prince Edward Island to British 

 Columbia it has been found that roses may be grown fairly readily in many 

 districts where it M-as formerly supposed they could not be produced except 

 under glass. The present bulletin is believed to be applicable throughout 

 Canada. It discusses sites and soils suitable for roses ; plants and planting ; 

 cultivation, watering, and manuring ; pruning ; winter protection ; inects and 

 fungus enemies; and propagation. Descriptive varietal lists are given of vari- 

 ous types of roses, including information relative to the varieties that have 

 succeeded best. Notes are also given on the origin of popular classes of roses, 

 as well as on the appearance of some modern roses. The bulletin concludes 

 with a list of roses tested at Ottawa from 1891 to 1911. 



It is concluded in general that Rosa rugosa and hybrids, Austrian briars, 

 Provence or cabbage roses, damask roses, and moss roses need little or no 

 protection in most parts of Canada. All other roses must be given more or 

 less protection during the winter, except in very favored localities. 



The art of landscape architecture, its development and its application to 

 modern landscape gardening, S. Parsons {New York: O. P. Putnam's Sons, 1915, 

 pp. XXI -{-347, pis. 45). — An exposition on the evolution of landscape gardening 

 and different methods of laying out grounds. The subject matter is considered 

 under the general headings of the laying out of a park or estate, the size and 

 extent of an estate, inclosures, the location of buildings, grass spaces, roads 

 and paths, water, islands, rocks, grading and shaping grounds, plantations, 

 maintenance, gardens, public parks, and choice trees and shrubs. 



A bibliography of works on landscape gardening is appended. 



Landscape gardening as applied to home decoration, S. T. Maynakd {New 

 York: John Wiley & Sons, 1915, 2. ed., rev. and enl., pp. XIX-\-396, pi. 1, figs. 

 190). — The present edition of this work (E. S. R., 11, p. 852) has been revised 



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