HORTICULTURE. 139 



A bibliography of studies dealing witli the ripening processes of fruits is 

 appended. 



Coconut palm culture, H. Zaepernick {Tropenpflanzcr, Beihefte, 12 {1911), 

 No. 6, pp. 500-611, pi. 1, figs. 22).— A popular treatise on the culture and ex- 

 ploitation of the coconut palm (Gocos nucifera), the subject matter being 

 based upon the author's experience of several years in Ceylon, Java, and Dutch 

 New Guinea. 



The kola trees and kola nuts, A. Chevalier and E. Pebrot {Veg. Utiles 

 Afriquc Trap. Franc., 1911, No. 6, pp. XXIV+.'fSS, pis. 35, figs. 33, maps 3) .— 

 This monograph comprises historical, botanical, geographical, biological, chemi- 

 cal, pharmacological, and economic studies of the kola trees and kola nuts. 

 With a view to making the work complete the authors have coordinated the 

 results of their own extensive studies in Africa with the results of investi- 

 gators on various phases of the subject. In the botanical section, which con- 

 tains the greater amount of new information, the principal phases considered 

 are the delimitation of the section Eucola, comprising the true kolas, a mor- 

 phological, anatomical, and systematic study of the species, and a biological 

 study of the kola trees. Particular attention is paid to the differentiation of 

 the various species. 



The study as a whole is intended as a reference work for specialists and as 

 a general handbook of information for those interested in the culture and 

 utilization of the kola nut. 



A new tea plant, C. Gbimme (Umschau, 15 {1911), No. ^1, pp. 851, 852, fig. 

 1). — A short descriptive account is given of Catha cdulis, which occurs in large 

 quantities in East Africa, particularly in Abyssinia. The leaves and young 

 shoots of this plant have recently appeared on European markets as a substi- 

 tute for tea. 



Alpine flowers and rock g'ardens, W. P. Wright {London, [1911], 2. ed., pp. 

 292, pis. 55). — The special feature of this work consists of an extensive series 

 of color groups of alpines taken direct from nature. 



Part 1 deals with the characteristics and habitat of alpine plants in nature 

 and in British gardens; part 2, which is contributed by W. Graveson, comprises 

 notes on alpine plants in their native habitat ; part 3 deals with the formation 

 of rockeries, planting, propagating, and culture of alpines ; and part 4 con- 

 tains special chapters on the most important rock plants, together with a brief 

 description of the best alpine plants and selections for various purposes. 



Rock g'ardens; how to make and maintain them, L. B. Meredith {London, 



1910, pp. XX+38.!/, pis. 16, figs. 6). — This comprises a practical guide for mak- 

 ing and planting rock gardens, including estimates of cost. 



Select carnations, picotees, and pinks: The history and cultivation of all 

 sections, J. Fraser {London, [1911], pp. IV+WS, figs. 39). — A popular treat- 

 ise which aims to present a record of a number of the best varieties of carna- 

 tions, picotees, and pinks, together with practical details of cultivation. 



Th.e sweet pea, C. A. Jardine {[London, 1911], pp. -JS, dgms. 3). — ^A popular 

 treatise in which the author describes methods of growing sweet peas in 

 favorable and unfavorable localities. Attention is also paid to the importance 

 of the nitrogen-fixing bacteria in the successful culture of sweet peas. 



Vines and how to grow them, W. C. McCollom ( Garden City and New York, 



1911, pp. 3L'i, j)ls. 31). — This is a manual of outdoor and indoor climbing plants 

 for flower, foliage, and fruit effects, both ornamental and useful, including 

 shrubs and similar forms that may be used as vines. The general chapters 

 deal with the uses and habits of vines, when and how to plant, soil and cultiva- 

 tion, supports and trellises, pruning and management, insects and diseases, and 

 winterkilling and how to prevent it. In the succeeding chapters the various 

 classes of vines are discussed relative to their specific adaptation and culture. 



22214°— No. 2—12 4 



