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



33. Schleh, [ ]. Einfluss der Aufbewahrung der Kartoffeln auf den Ertrag. [Influ- 

 ence of the storage of potatoes upon the yield.] Illustr. Landw. Zeitg. 39: 429-430. 1919. — A 

 popular discussion of the proper storage of potatoes in relation to their use as seed. Accord- 

 ing to the writer, too high temperatures during storage are the chief causes of seed degenera- 

 tion. — John W. Roberts. 



34. Simpson, S. Annual Report of the Department of Agriculture, Uganda Protectorate, 

 for the year ending 31st March, 1918. 69 p. Uganda Protectorate Dept. Agric. 1918. 



35. Spkagg, Frank A. The coefficient of yield. Jour. Amer. Soc. Agron. 12: 168-174. 

 1920. — The coefficient of yield is the quotient obtained by dividing the yield of a variety by 

 the calculated yield of the standard or check variety, growing on the same plot the same 

 year. The coefficient of yield method of interpreting results have been used for 6 years and 

 has proven superior to any of the old methods. A compound coefficient of various factors 

 affecting yield, is illustrated showing how it is possible to find superior varieties of field crops. 

 — F. M. Schertz. 



36. Spring, F. G., and J. N. Milstjm. Notes on the cultivation of ragi (Eleusine cora- 

 cans). Bull. Dept. Agric. Federated Malay States 7: 154-161. 1919. — Results are given of 

 the introductory tests of this grain into Malaya, also a consideration of it as a commercial 

 crop. — T. F. Chipp. 



37. Sylven, Nils. Ar det mojligt att inom landet aterupptaga en mera omfattande odling 

 av oljevaxter for industriens behov av feta oljor? [Is it possible to again take up a more com- 

 prehensive domestic production of oil plants to supply the demands of industry for fatty oils?] 

 Sver. Utsadesf. Tidskr. 29: 173-205. 1919. — Summary of oil production in Sweden in previous 

 years; effect of the war; factors affecting present demands for oils and present production; 

 market conditions and future prospects. — E. G. Anderson. 



38. Tedin, Hans. Tre ars forsok med olika havresorter vid Hallands Frokontor i Getinge. 

 [Three years tests of different varieties of oats at the Halland seed office at Getinge.] Sver. Ut- 

 sadesf. Tidskr. 29: 224-230. 1919. 



39. Voss, C. Zur Bekampfung von Ackersenf und Hederich. [On the control of field-mus- 

 tard (Sinapis arvensis L.) and hedge-mustard (Raphanus raphanistrum L.).] Illustr. Landw. 

 Zeitg. 39: 324-325. 1919. — Excellent results were obtained by dusting the weeds with a finely 

 ground mixture of kainit (2.5 Ztr.) and calcium nitrate (17.5 kgm.), especially when applied 

 while the weeds were covered with dew. A solution of ammonium sulphate, applied as a 

 spray, proved superior to a solution of iron sulphate similarly applied. The former proved 

 to be the better weed-killer and was less injurious to cultivated plants. — John W. Roberts. 



40. Wadsack, A. Anbau der wichtigsten Oelfruchte. [The culture of the more important 

 oil-producing plants.] Illustr. Landw. Zeitg. 39: 275-280. 1919. — A short, popular, discussion 

 advocating greater production of oil-producing plants to meet the shortage of animal fats. — 

 John W. Roberts. 



41. Weibull, M. Om fetthalten i skanska rapsfron ar 1918. [On the oil-content of Skane 

 rape-seed in 1918.] K. Landtbr. Akad. Handl. och Tidskr. 58: 236-240. 1919.— Results of 

 determinations of oil content of rape seed grown in 1918 in different parts of Sk&ne and under 

 varying conditions. — E. G. Anderson. 



42. Witte, Hernfrid. Omfattning of Danmarks nuvarande frb'odling. [Summary of 

 present seed production in Denmark.] Sven. Utsadesf. Tidskr. 29: 163-164. 1919. 



