114 AGRONOMY [BoT. Absts., Vol. VIII, 



768. Barbillion, M. Possibilities of new fibres for pulp and paper making. Paper 26": 

 11-12, 32. 1920. — This article discusses esparto, bamboo, papyrus, broom, nettle, and other 

 plants which are grown in France or its colonies and possess paper-making possibilities. — 

 H.N. Lee. 



769. Becker-Dillingen, J. Serologische Untersuchungen auf dem Gebiete von Pflanzen- 

 bau und Pflanzenzucht. [Serum investigations in the field of plant structure and plant breed- 

 ing.] Landw. Jahrb. 53: 245-276. 1919. — The author uses the serum and antigene method 

 to determine impurities in meal and in seeds. He describes in detail the methods of pre- 

 paring the antigene and the serum and reviews the literature. He finds that it is possible 

 to make a quantitative determination of the amounts of Agrostemma githago seed in meal, 

 an admixture of 0.125 per cent giving a specific reaction. Other common weed seeds as well 

 as mixtures of weed seeds were studied with similar conclusions. The source of red clover 

 seed could be determined in this way by noting the specific reaction due to the presence of 

 characteristic weed seeds. By this method the seeds of Brassica napus could be distinguished 

 from those of Brassica rapa, and the author was even able to distinguish between 2 different 

 varieties of barley by making a serum test with the ground seed. All methods are described 

 in detail since much of the success of the operation is said to depend on the proportions of 

 antigene and serum. — A. J. Pieters. 



770. Berry, Reginald Arthur. Composition and properties of oat grain and straw. 

 Jour. Agric. Sci. 10: 359-414. Fig. 1-5. 1920. — An extensive study with detailed chemical 

 analyses of the composition of oat grain and straw. Changes during growth, varietal differ- 

 ences, and a large nimiber of correlations of various properties are brought out. — V . H . Young. 



771. Cereceda, J. Dantin. Catalog© methodico de las plantas cultivadas (especies y 

 variedades) en EspaSa y de las principales especies arboreas. [Methodical catalogue of the 

 plants (species and varieties) cultivated in Spain, and of the principal tree species.] 62 p., 

 22 fig. Servicio de Publicaciones de Agricolas del Ministerio de Fomento: Madrid, 1920. — 

 The classified list gives the botanical and common names for each species and variety culti- 

 vated in Spain. The species are grouped according to economic use except in the case of 

 fruit trees, which are exemplified by olive and oranges, and sugar and cereals, which are 

 grouped with reference to climatic adaptations. — C. V. Piper. 



772. Clayton, E. S. Field experiments with maize. Grafton experiment farm, 191^ 

 1920. Agric. Gaz. New South Wales 32 : 1-6. 1921.— In the experiment, hilling vs. flat culti- 

 vation of maize, hilling was done by the plow and by disc cultivating. Hilling by plowing 

 decreased the crop but hilling by disc cultivating showed a net increase of crop over the check 

 plats. The main advantage of hilling is that it smothers weeds in the row. — An experiment 

 in de-suckering Leaming maize showed a net loss of about $1.40 per acre. — In depth of cultiva- 

 tion experiments, deep cultivation during season and deep cultivation followed by shallow 

 cultivation were compared with continuous shallow cultivation. Deep cultivation resulted 

 in loss, and deep followed by shallow cultivation resulted in a small net gain.— In green manur- 

 ing experiments, the object was to determine value of green manures sown in standing maize 

 at tasseling time where maize is grown as a continuous crop. In the first year of experimenting, 

 rape, vetches, and Grey field peas were used as green manuring crops; yields, when compared 

 with plat receiving usual treatment, were not lessened the first year. — In a late cultivation 

 experiment, maize received no cultivation after hilling (crop 18 inches high) in comparison 

 with usual cultivation after hilling. The latter showed marked net gain per acre. — In rate 

 of seeding trials with 2 varieties, the heavier seedings gave greatest net increases per acre. — 

 L. R. Waldron. 



773. Crocker, William. Influence of a crop on succeeding one. [Rev. of: (1) Hart- 

 well, B. L., and S. C. Damon. The influence of crop plants on those which follow. Rhode 

 Island Agric. Exp. Sta. Bull. 175. 1918. (2) Hartwell, B. L., F. R. Pember, and G. E. 

 Merkle. The influence of crop plants on those which follow. Rhode Island Agric. Exp. 

 Sta. Bull. 176. 1919 (see Bot. Absts. 6, Entry 18).] Bot. Gaz. 68: 480-482. 1919. 



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