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



8. Carrier, Lyman. The history of the silo. Jour. Amer. Soc. Agron. 12: 175-182. 

 1920. — -Silos or hermetically sealed grain pits were first used in the dry Mediterranean coun- 

 tries before the Christian era. Egyptian, Spanish, American Indian, Roman, German, French 

 and American types of silos are discussed. The silo in America is especially emphasized. — 

 F. M. Schertz. 



9. Chodat, R. Etudes faites au jardin alpin de la "Linnaea." 1. Sur quelques faits de 

 botanique et de geographie economique a Bourg-Saint-Pierre. [Observations made at the 

 "Linnaea" alpine garden. 1. Concerning certain things of economic value related to botany and 

 geography at St. Pierre.] Bull. Soc. Bot. Geneve 11: 30-41. 1919. — A general description of 

 the mountainous country at St. Pierre (France) is accompanied by a list of wild and cultivated 

 plants that are used for food or medicine. — W. H. Emig. 



10. Coombs, G. E. Notes on economic botany during 1918. Agric. Bull. Federated Malay 

 States 7:86-88. 1919. — Brief notes on rice culture, green manures, rubber, and coconuts. — 

 E. D. Merrill. 



11. Damon, S. C. A five-year rotation of potatoes, rye straw and squashes, onions, oats 

 and rowen, and hay. Rhode Island Agric. Exp. Sta. Bull. 178. 15 p. 1919. — The results of 

 the first 24 years are recorded. Every crop in the rotation was grown each year. Stable ma- 

 nure was used only on the squashes ; fertilizer on the other crops. There is a comparison of the 

 fertilizer ingredients added, with those removed in the crop; and a discussion of the financial 

 returns. — B. L. Hartwell. 



12. Derlitzki, [ ]. Zur Sorten und Saatgutfrage der Wintergerste. [Concerning 



winter-barley varieties and seed.] Illustr. Landw. Zeitg. 39: 312-313. Fig. U5-247. 1919.— 

 A short, popular discussion of winter-barley varieties from the growers point of view. — John 

 W. Roberts. 



13. Greve, W. Ratschlage zur Bekampfung der Ackerunkrauter. [Advice as to the 

 control of farm weeds.] Illustr. Landw. Zeitg. 39: 200-202. Fig. 149-161. 1919.— A popular 

 discussion of the subject. Cultivation, selection of pure seed, drainage, applications of iron 

 sulphate, kainit, and calcium nitrate are the prinicpal measures advocated for the control 

 of various weeds. — John W. Roberts. 



14. Harris, F. S., and Butt, N. I. The unreliability of short time experiments. Jour. 

 Amer. Soc. Agron. 12: 158-167. 1920. — Data from experiments with potatoes, sugar beets, 

 alfalfa, corn, oats, and wheat show that short-time experiments are subject to error where 

 a complete cycle of seasonal fluctuations is not included. Experiments conducted at Logan, 

 Utah, show that the divergence varies in different years. Manuring experiments have wider 

 variations from the average than irrigation experiments. Under dry farming conditions vari- 

 ations are wider than under irrigation conditions and small irrigations vary more than where 

 the optimum amount of water is supplied. Potatoes varied most in yield and were followed 

 by sugar beets, alfalfa, corn, oats, and wheat, in order. Experiments requiring personal 

 judgment vary more than those requiring only mechanical measurements. — F. M. Schertz. 



15. Hartwell, Burt L. Thirty-first annual report of the Director of the Rhode Island 

 Agricultural Experiment Station. Rhode Island State Coll. Bull. 14: 57-65. 1919.— The 

 report is for 1918 and gives brief statements of the results of the experiments, grouped in part 

 under the following headings: organic matter for the soil; efficiency of fertilizers and other 

 manures; specific plant differences and needs; effect of crops on each other; inheritance 

 studies with poultry and rabbits. — B. L. Hartwell. 



16. Hartwell, Burt L., and S. C. Damon. A field comparison of hydrated lime with 

 limestone of different degrees of fineness. Rhode Island Agric. Exp. Sta. Bull. 180. 18 p. 

 1919. — During the year of application, 80-mesh limestone had the same effect as an equivalent 



