138 AGRONOMY [BoT. Absts., Vol. X, 



centrifugal sugar of 96° polarization has been made in 3 or 4 centrals controlled by American 

 and Spanish capital. The cane cultivated is mostly native and little has been done to improve 

 the crop. On Mindoro, the owners of the central have obtained good results by planting new 

 varieties and using fertilizers. The islands have an ideal climate and great supply of suitable 

 land for growing cane, but labor is scarce. — C. Rumbold. 



886. DucoMET, V. A propos des semis de pommes de terre. [Concerning potato seed.] 

 Jour. Soc. Nation. Hort. France 22: 126-131. 1921. — The author discusses the theory of 

 degeneracy in plants propagated asexually and gives results secured from potato seed. He 

 concludes that the evidence does not justify the belief that sexual reproduction is necessary to 

 the maintenance of vigor and productivity. In his experiments a large percentage of the 

 potatoes produced from seed were inferior to the female parent, morphologically, physio- 

 logically, and pathologically. — H. C. Thompson. 



887. Frierson, L. S. The value of tilth in agriculture. Science 54: 193-194. 1921.— 

 Stimulation of plant growth by cultivating the soil, so far as movement of the soil water is 

 concerned, is attributed to moisture conservation and to the fact that minerals left at the 

 surface by evaporation, inaccessible to the feeding roots, are, by cultivation, moved to the 

 subsurface where the roots can utilize them. — H. L. Westover. 



888. Gaylord, F. C. Why not good potatoes? Gard. Mag. 32: 310-312. 5 fig. 1921.— 

 The author briefly discusses seed selection and methods used in growing potatoes, including 

 varieties, disease treatment, and cultural practices. — H. C. Thompson. 



889. Gennys, R. H. Harvest report. Glen Innes experiment farm. Agric. Gaz. New 

 South Wales 32 : 578. 1921. — Yields of 4 wheat and 4 oat varieties are given. — L. R. Waldron. 



890. GiROLA, Carlos D. Destrucci6n de las plantes invasoras perjudiciales, vivaces y 

 anuales . Instrucciones a los agricul tores de la direccion de agricultura de la Republica Argentina. 

 [Destruction of weeds.] Rev. Agric. Com. y Trab. [Cuba] 3 : 3S3-386. 1920. 



891. Good, E. S., L. J. Horlacher, and J. C. Grimes. A comparison of corn silage and 

 sorghum silage for fattening steers. Kentucky Agric. Exp. Sta. Bull. 233. 59-89 1921. — A 

 report is given of a 5-year study of the value of corn and sorghum as silage for feeding steers, 

 considered from the standpoint of yield and cost of production. As regards economy in beef 

 production, sorghum silage proved 92.2 per cent as economical as corn silage. — W. D. Valleau. 



892. Gouaux, C. B. Summary of results of fertilizer and other field work with sugar cane 

 for 1919-1920. Louisiana State Univ. Div. Agric. Ext. Circ. 47. 20 p. 1921.— Results of 

 fertilizer experiments with sugar cane on various plantations in Louisiana are given. — C. W. 

 Edgerton. 



893. Green, A. W. Grass-grub control. New Zealand Jour. Agric. 21 : 174-175. 1920. — 

 The grass-grub {Odontria zealandica) is often destructive in small areas of pasture land. 

 Fencing such areas and using them as feed lots for heavy live stock has been found to destroy 

 practically all grubs. — A^. J. Giddings. 



894. Helm, C. A. Corn in Missouri. IL Field methods that increase the corn crop. Mis- 

 souri Agric. Exp. Sta. Bull. 185. 20 p. 1921. — E.xperiments on tillage and method and rate of 

 planting and comparative yield tests of corn are briefly discussed. — L. J. Stadler. 



895. Heriot, T. H. P. The manufacture of sugar from the cane and beet. Illus. Mono- 

 graphs on Industrial Chemistry. Longmans, Green and Co.: London, 1920. — Part 1. Sugar 

 beet, sugarcane, and other sugar-producing plants. Part2. Extractionof juice from the cane: 

 principles of the milling process. Part 3. Extraction of sugar from the beet: principles of 

 the diffusion process. Part4. Compositionof cane and beet juices: properties of the sugars. 

 Part 5. Treatment of cane and beet juices: chemical agents used and method of heating the 



