19161 HOBTICULTURE. 745 



tin on blueberry culture (E. S. R., 34, p. 534) and the article previously noted 



(E. S. K., 35, p. 647). 



The effect of org-anic matter on citrus growth, J. F. Breazeale {Cal. 

 Citrogr., 1 (1916), No. 11, pp. 7, 19, figs. S). — By way of summing up the evi- 

 dence relative to the mosaic disease or mottling of citrus fruits, the author 

 states that practically all investigators at the present time agree that mottling 

 is one of the so-called soil troubles. The experience of the author, working 

 with citrus water cultures and pot cultures, shows that an application of soluble 

 organic matter, the so-called humus extracted from peat, decomposed alfalfa, 

 and the like, even in minute amounts, 5 or 10 parts per million, will bring about 

 a decidedly stimulating effect upon the citrus seedlings. These results, consid- 

 ered in connection with the soil types of the Riverside citrus area, led him to 

 conclude that mottling may be rightly called malnutrition. It can be traced 

 back to the root tip and is undoubtedly influenced in a large measure by the 

 scarcity of organic matter in the soil. 



California grapefniit, A. D. Shamel {Mo. Bui. Com. Hort. Cal., 5 (1916), 

 No. 7, pp. 2S9-249, figs. 4). — This paper has been previously noted under another 

 title (E. S. R., 34, p. 835). 



Notes on coffee in Java, P. J. Westek (Philippine Agr. Rev. [English Ed.], 9 

 (1916), No. 2, pp. 120-132, pis. 7). — This comprises extracts from a report to the 

 Philippine Bureau of Agriculture on the coffee industry in Java and deals par- 

 ticularly with the kinds of coffee and the process of preparing coffee for market. 

 Data on the cost of production are also given. 



The germination of tea seed, C. Bernabd (Dept. Landb., Nijv. en Handel 

 [Dutch East Indies], Meded. Procfstat. Thee, No. 43 (1915), pp. 30-88, pis. 6).— 

 In this paper the author describes the germination process of tea seed, and 

 gives the results of some germination tests in which the seeds were sown with 

 and without the hard shell, placed with the eye in different positions, and 

 grown under different strengths of light. 



The selection of the tea plant, III, P. van Leeesum and 0. Beenaed (Dept. 

 Landb., Nijv. en Handel [Dutch East Indies], Meded. Proefstat. Thee, No. 4S 

 (1915), pp. 1-29, pis. 3). — This comprises a further report on experiments being 

 conducted by the authors with the special object of developing through selection 

 a race of tea better adapted to conditions in Java than the present forms (E. S. 

 R., 30, p. 444). The results secured from germination tests of selected strains of 

 seed are reported, and suggestions are given for conducting selection experi- 

 ments. 



Experience in top-working hickories, F. B. Guinn (Amer. Fruits, 24 (1916), 

 No. 2, p. 27). — In this paper the author gives a brief account of his experience 

 in top-working hickory trees with different varieties of pecans. 



How to make a flower garden (Harrisburg, Pa.: The Countryside Press, 1915, 

 pp. 75, figs. 15). — A small practical treatise. 



Peonies, J. H. Speeby (Country Gent., 81 (1916), No. 34, pp. 1556. 1557, figs. 

 5). —In this article the author discusses the general cultural treatment of 

 peonies and gives a descriptive list of some of the best varieties of herbaceous 

 Chinese peonies as observed during the season of 1916. 



Roses of Denmark, S. Almqihst (Bot. Tidsskr., 34 (1916), No 6, pp. 257- 

 287).— An account of the rose flora of Denmark, including a classification of 

 types and descriptions of species. 



The white-barked pine, D. F. Higgins (Jour. Heredity, 7 (1916), No. 9, pp. 

 399-401, figs. 2).— A brief descriptive account and illustrations are given of the 

 white-barked (Pinus bungeana), which is grown in China as an ornamental 

 and has been introduced into the United States for trial by the U. S. Depart- 

 ment of Agriculture. 



