538 EXPERIMENT STATION RECORD. [Vol.36 



this subject read before the American Genetic Association in New York City 

 in December, 1916, in which the author points out that recent studies with 

 lemons in California have shown bud variation to take place as in the earlier 

 work with the Washington navel orange (E. S. R., 34, p. 639). The records 

 and observations of the lemon studies are to be published at a later date. The 

 desirability of further systematic investigations of bud variations in citrus 

 fruits grown in other regions and in all other plants propagated vegetatively 

 is pointed out. 



Notes on oranges and lemons, H. J. Davies {Dept. Land Rec. and Agr., 

 United Prov. Agra and Oudh, Bui. 38 (1916), pp. 22). — Cultural notes, with 

 special reference to conditions in India, are given. 



How to fertilize olive trees, A. Rolet (Vie. Agr et Rurale, 6 (1916), No. 53, 

 pp. 474-479, figs. 3). — Suggestions on fertilizing olive trees, with fertilizer for- 

 mulas recommended by different authorities, are presented. 



Mang'anese as a cause of the depression of the assimilation of iron by 

 pineapple plants, M. O. Johnson (Jour. Indus, and Engin. Chem., 9 (1917), No. 

 1, pp. 47-49, fig. 1). — A summarized account of experiments which will be given 

 in fuller detail in a publication of the Hawaii Experiment Station. 



In continuation of the investigations by Wilcox and Kelley (E. S. R., 27, p. 

 842), showing the detrimental effects of manganese in pineapple soils in Ha- 

 waii, the author finds that the manganese of the highly manganiferous soils of 

 the island of Oahu is nearly, if not all, in the dioxid form, and that the toxic 

 effect observed on pineapple plants is due to a depression in the assimilation of 

 iron. Pineapple plants have recovered from the toxic effects of manganese 

 when supplied with iron through the leaves by means of sprays. A commer- 

 cially successful treatment has been worked out and the profitable utilization 

 of these highly manganiferous soils seems assured. 



Soil management in cinchona culture, P. van Leicrsum (Orondbewerking 

 hi) de Kinacultuur. Surabaya, Java: Nederland.-Ind. Landb. Synd., 1916, pp. 

 ^3)_ — A. paper introducing themes for discussion at the Dutch India Soil Con- 

 gress at Djokja, in October, 1916. Some comparative data are given showing 

 the beneficial results of intensive culture in growing cinchona. 



The cultivation of belladonna in California, A. Schneider (California Sta. 

 Bui. 275 (1916), pp. 135-160, figs. i2).— This bulletin gives directions for growing 

 belladonna based upon numerous field tests, many of which were on a com- 

 mercial scale, conducted under the direction of the station. The California 

 and other American cultural experiments with belladonna are summarized and 

 the plant is considered with reference to climatic and soil requirements, seed 

 germination and care of the seedlings, transplanting seedlings and crown 

 cuttings, care of the crop, harvesting, preparation for market, yields, and field 

 enemies of belladonna. Data are also given relative to the alkaloidal yield of 

 belladonna of different ages, together with suggestions for increasing the 

 alkaloidal contents of the plants. 



Possibility of the commercial production of lemon-grass oil in the United 

 States, S. C. Hood (U. S. Dept. Agr. Bui. 442 (1917), pp. 12, figs. 5).— This bulle- 

 tin combines directions for growing lemon grass (Cymbopogon citratus) and the 

 production of oil with the results of experiments conducted by the Bureau of 

 Plant Industry in central Florida during the past eight years in which field 

 tests were made with 13 varieties secured from 8 different parts of the world. 



Consideration is given to the soil and climatic requirements of lemon grass, 

 propagation, fertilizers and cultivation, harvesting, distillation, varieties, factors 

 affecting the yield and citral content of lemon-grass oil, solubility of lemon- 

 grass oil in alcohol, and commercial possibilities. The experiments as a whole 

 indicate that the production of lemon-grass oil would not be profitable if all 



