212 AGRONOMY [Bot. Absts., Vol. VI, 



on for several years. Different soils and different crops have been investigated. It is sug- 

 gested that plants growing for three or four weeks in pot cultures in the greenhouse could 

 be used, according to the plan devised, to determine the proper treatment of the soil in the 

 field. This work could be done in the winter months. Truck growers who use large green- 

 houses have an excellent chance to test out the proposed method. The article concludes 

 with emphasizing the necessity of improving the present practice in the utilization of fer- 

 tilizer in plant production. More exact knowledge is needed as to the best salts to combine 

 and as to the best ratios of these salts. — H. C. Young. 



1420. Jenkins, E. H., W. L. Slate, D. F. Jones, and B. A. Brown. Varieties and 

 strains of corn for Connecticut. Connecticut (New Haven) Agric. Exp. Sta. and Storrs (Con- 

 necticut) Agric. Exp. Sta. Joint Bull. 3. 15 p. 1919. — A report of progress in testing the 

 prominent varieties and strains of corn for yields of grain and silage. — Henry Dorsey. 



1421. Judd, C. S. Morning glory weed. Hawaiian Forester and Agric. 16: 4-5. 1919. — 

 Notes occurrence of this pest in two localities along Kahului Railway. The area involved 

 is very small, and efforts to bring about the complete eradication of the weed will probably 

 prove successful.— Stanley Coulter. 



1422. Leape, H. M., and H. E. Annett. Investigations concerning the production of 

 Indian opium for medical purposes. Agric. Jour. India 15 : 124-134. 1920. — A study was made 

 of the morphine content of different varieties of opium grown under varying climatic condi- 

 tions. Nitrogenous substances were the only fertilizing materials which resulted in increased 

 production. Sodium nitrate increased the size of capsules and the amount of latex, but did 

 not increase the percentage of morphine in the opium. The number of capsules borne on a 

 plant is correlated with the morphine content of the opium produced. The terminal capsules 

 are richer in morphine than the lateral ones, the difference varying from 2 to 7 per cent. 

 About 500 varieties were examined for their morphine content and were found to vary from 

 6.5 to 20.5 per cent. The material produced from the first lancings of the poppy capsules 

 had a higher morphine content than that produced from succeeding lancings. — J. J. Skinner. 



1423. Letteer, C. R. The work of the San Antonio experiment farm in 1918. U. S. 

 Dept. Agric. Dept. Circ. 73. 38 p., 4 fid- 1920. — The report includes discussion of topics as 

 follows: Crop conditions; effect of rotation and tillage on cotton root-rot; experiments with 

 and notes on cotton, corn, oats, Sudan grass, cowpeas, sorghums, flax, bean varieties, Rhodes 

 grass, fruits and ornamental plantings; experiments in cotton root-rot control, under the 

 headings, soil treatment, mulches, and excavations. — L. R. Hesler. 



1424. Lovejoy, P. S. Farms vs. forests. Michigan Acad. Sci. Ann. Rept. 21: 201-212- 

 1919.— See Bot. Absts. 6, Entry 1559. 



1425. Nelson, J. C. [Rev. of: Hitchcock, A. S. The genera of grasses of the United 

 States, with special reference to the economic species. U. S. Dept. Agric. Bull. 772. 307 p., 

 20 pi., 174 fig. Government Printing Office: Washington; 1920. Price $.40.] Torreya 20: 

 84-88. 1920. 



1426. Parmentier, Paul. Les irrigations et les arrosages en Syrie et en Palestine. 

 [Irrigation in Syria and Palestine. 1 Compt. Rend. Acad. Sci. Paris 169:391-393. 1919. — 

 See Bot. Absts. 6, Entry 1829. 



1427. Parry and Company. The development of cane planting by the East India distil- 

 leries and sugar factories. Agric. Jour. India 15: 154-159. 2 pi. 1920. — The yield and 

 purity of sugar produced by a number of varieties of cane are given. The variety "Fiji B" 

 produced 48 tons per acre, which was the largest yield secured. The purity of the sugar from 

 this variety was also highest. — J. J. Skinner. 



