Neue Litteratur. 191 



seed com (Maize), with illustrations of the method. — W. T. 

 Swingle]. 



Morstatt, H. 1910. Ueber die Mkongafrüchte [Balanites aegyptica]. 

 (Der Pflanzer. VI. 8. p. 121-122.) 



Netzseh, J. 1910. Die Bedeutung der Fluorverbindungen für die 

 Holzkonservierung. (Natw. Zschr. Forst- u. Landw. VIII. 8. p. 377.) 



Nieholls, H. A. A. 1910. Manual de agricultura tropical. Tradu- 

 cido del indes por H. Pittier. 2. ed. castellana. (Friburgo [Frei- 

 burg LB.], Herder, 1910 8°. XVI, 314 pp. 43 Abb.) 



Oakley, R. A. 1910. Canada Bluegrass: Its Culture and Uses. 

 (Farmers' Bull. 402. U. S. Dept. Agric. Washington, D. C. 20 pp. 

 7 figs. 1910.) [Canada bluegrass, Poa compressa L., is chiefly 

 known as an adulterant of the Kentucky bluegrass, Poa pratensis 

 L., and from this fact its value has been overlooked. On very 

 poor clay or gravely soils especially those that become very dry 

 at times the Canada bluegrass grows much better than the Ken- 

 tucky bluegrass. It makes a good pasture especially for finishing 

 beef cattle for export. It yields too little to be valuable as a hay 

 grass though sometimes as much as one and a half tons per acre 

 are secured (3766 kg. per hectare). — W. T. Swingle.] 



O'Gara, P. J. 1910. The Protection of Orchards in the Pacific 

 Northwest from Spring Frosts by means of Fires and Smudges. 

 (Farmers' Bull. 401. U. S. Dept. Agric. Washington, D. C. 

 24 pp. 11 figs. 1910.) [Apple peach and peer orchards are pro- 

 tected from spring frosts in the Rogue River Valley in southern 

 Oregon by fires and smoke. The cost per acre was from $ 3.00 to 

 $ 4.00 including labor. A table is given of estimates of the tem- 

 peratures injurious to buds, flowers, setting fruit etc. for almond, 

 apple, apricot, cherry, peach, pear, plum and prune. — W. T. 

 Swingle.] 



Ostermayer, A. 1910. Der Pflanzenbau. (Wien 1910. 8°. 163 pp. 1 

 färb. Taf. 161 Fig.) 



Perrot, E. 1910. Etüde pharmacognosique du Myrica Gale L. 

 (Gale palustris (Lamk.) A. Chev.). (Bull. Sc. pharm. XVII. p. 253.) 



Perrot, E. 1910. Sur le Pseudocinchona africana A. Chev. (Bull. 

 Sc. pharm. XVII. p. 187.) 



Piper, C. V. and S. M. Traey. 1910. The Florida velvet Bean 

 (Stizolobium deeringianum Bort.) and related Plants. (Bull. Dept. 

 Agric. Washington. 1910. 26 pp. 7 pl.) 



Pogge, C. 1910. Nutzholzbäume Deutsch-Südwestafrikas. (Zschr. 

 Forst- u. Jagdw. XLII. 7. p. 400.) 



Roberts, H. F. 1910. A quantitative Method for the Determination 

 of Hardness in Wheat. (Bull. 167. Kansas agric. Expt. Stat. (Man- 

 hattan, Kans.). p. 371 — 390. 3 figs.) [A technical account of a new 

 machine for determining the crushing point of wheat grains with 

 a discussion of the constants involved. — W. T. Swingle]. 



Rother, W. O. 1910. Praktischer Leitfaden für die Anzucht und 

 Pflege der Kakteen und Phyllokakteen. 2. Aufl. (Frankfurt a. O. 

 1910. 8°. mit 88 Fig.) 



Sehlich, W. 1910. Manual of Forestry. Vol. III: Sylviculture. 4. ed. 

 (London. 8°. 434 pp. ill.) 



Sehmitthenner, F. 1910. Der anatomische Bau der Rebentriebe 

 und seine Bedeutug für die Rebenveredelungstechnik. (Jahrber. 

 Ver. angew. Bot. VII. Mit 5 Abb.) 



Sehrwald, K. 1910. Das Obst der Tropen. (Berlin, 1910. 8°. 

 Mit 43 Abb.) 



