No. 2, September, 1920] HORTICULTURE 233 



1762. Pellett, Frank C. American honey plants, together with those which are of spe- 

 cial value to the beekeeper as sources of pollen. 15 x 23 cm. 297 p., 155 Must. American Bee 

 Journal: Hamilton, Illinois, 1920. — The book is primarily an annotated and illustrated list 

 of a very large number of plants that are of more or less interest to beekeepers. Each plant is 

 listed in alphabetical order by some "common" name, but the Latin name is added in each case 

 and a cross-referenced index makes it possible to find a given entry by either name. Names of 

 states in the United States and of provinces in Canada are inserted in the alphabetical arrange- 

 ment, each with a brief consideration of the honey-plants of that area. Many other names 

 besides those of plants and regions find place in the list; under P is found a discussion of about 

 seven pages on "Physiology of nectar secretion." The annotations are mainly with reference 

 to the production of honey or pollen, but many facts of plant distribution are stated. Numer- 

 ous quotations, with their sources are given. The geographical region considered is prac- 

 tically the United States, Alaska and Canada, rather than the whole of even North America. 

 The illustrations are mostly reproductions of photographs. The book contains much to 

 interest gardeners and plant-lovers generally, as well as beekeepers. — B. E. Livingston. 



1763. Pi ckford, Verne C. Control of air conditions in lemon storage rooms. California 

 Citrograph 5: 139, 164. 1920. 



1764. Quisumbing y Arguelles, E. Studies of Philippine bananas. Philippine Agric. 

 Rev. 12 3 : 1-73. SO pi. 1919. 



1765. Ravaz, L. Obtention des greffes-soudes. [Method of handling callused grape 

 grafts.] Prog. Agric. et Vitic. 74: 173-182. 1920. 



1766. Ravaz, L. Plantation des bouturos soins speciano. [Planting of cuttings — special 

 precautions.] Prog. Agric. et Vitic. 74: 21-32. 1920. — In planting grape cuttings "in situ" it is 

 recommended that only the cuttings from the base of canes be planted ; to mound them to avoid 

 injury by frost, or to stratify them in a reverse position and plant after roots have appeared. 

 The vineyard should be carefully cultivated. — L. Bonnet. 



1767. Rawes, A. N., and F. J. Chittenden. Effect of grass on apple trees. Jour. Roy. 

 Hortic. Soc. 45: 116-119. 1919. — Twenty-five trees of five varieties on crab and Paradise 

 stocks were grown at Wisley, England under continuous cultivation, under grass with a 

 space around the tree 2 to 3 feet in diameter kept bare and stirred at intervals, and under 

 a grass mulch. Growth and yield were largest where the trees were cultivated. — J. K. 

 Shaw. 



1768. Rives, Louis. Affinite des hybrides pour les porte-greffes. [Affinity of hybrids 

 for resistant stocks.] Prog. Agric. et Vitic. 74: 13-14. 1920. — The direct producers are 

 generally very exigent in water and give good results on vigorous resistant stocks. The Vin- 

 ifera Americans, 1202, the Aramon X Rupestris, the 93-5, show a sufficient affinity for them. 

 The Rupestris St. George gives varying results. The author concludes that affinities must 

 be studied experimentally in various soils and localities. — L. Bonnet. 



1769. Riviere, C. Le Jardin d'Essai d'Alger. [The Experimental Garden at Algiers.] 

 Rev. Hortic. 91: 340-342. Sept., 1919. 



1770. Riviere, G. De la progression de la maturation dans les poires a couteau. [Pro- 

 gression of ripening in table pears.] Jour. Soc. Nation. Hortic. France 20: 306-307. Dec, 1919. 

 — The author states that ripening of pears begins at the stem end and proceeds toward the 

 calyx end. Analyses were made to determine the sugar content of different parts of the pear 

 as it begins to ripen and it was found that the stem end section contained a larger percentage 

 of sugar than the middle section and the latter more than the calyx end section. From this the 

 author concludes that ripening progresses from the stem end toward the calyx end. — A table 

 showing the percentage of sugar in three cross sections of three varieties of pears is given. — 

 H. C. Thompson. 



