90 Botanisches Centralblatt. 



GassBer, G. 1919. Untersuchungen über die Sortenempfängiichkeit 



von Getreidepflanzen gegen Rostpilze. (Cbl. Bakt. 2. IL. p. 185—243.) 

 Giddings, N. J. and A. Berg. 1919. A comparison of the late blights 



of tomato and potato. fPr. rep.J (Phytopathology. IX. p. 209—210. 1 pl.) 

 Gladwin, F. E. 1917, Winter in injury of grapes. (Bull. New York 



agr. Exp. Stat. Geneva, N. Y. 1917. 433 p. 107—139. 8 pl.) 

 Hall, C. J. J. van 1919. Ziekten en plagen der cultuurgewassen in Neder- 



landsch-Indie in 1918. (Med. Labor. Plantenz. Batavia. 1919. 36. 49pp.) 

 HenniDg, E. 1918. Bidrag tili Kännedomen om den s. k. gulspets- 



sjukan hos sädesslagen. [Beiträge zur Kenntnis der Spitzendürre 



der Getreidearten]. (Medd. Centralanst. Försöksv. Jordbruksomr. 



bot. Avd. XV. 30 pp. 16 A. 1 T.) 

 Nalepa, A. 1918. Neue Gallmilben. 36. Forts. (Anz. Ak. Wiss. Wien 



math.-nat. Kl. LV. p. 351—353.) 

 Stevenson, J. A. 1918. Catologo de las enfermedades fungosas y no- 



parasiticas que atacan las plantas economicas de Puerto Rico. 



(Rev. agr. Puerto Rico. II. p, 19—27.) 

 Stevenson, J. A. 1918. La enfermedad del mosaico de tabaco. (Rev. 



agr. Puerto Rico. II. p. 39 — 44.) 

 Stewart, F. C. 1916. Observations on some degenerate strains of 



potatoes. (Bull. New York agr. Exp. Stat. Geneva, N. Y. 1916. 



422. p. 319—357. ill.) 

 Stewart, F. C. and A. J. Mix. 1917. Blackheart- and the aeration of 



potatoes in storage. (Bull. New York agr. Exp. Stat. Geneva, N. Y. 



1917. 436. p. 321-362. ill.) 

 Wälstedt, J. 1918. lakttagelser rörande slidsjukans uppträdande ä 



höstvete i Oestergötland sornmaren 1918, [Beobachtungen über 



das Auftreten der Blattschiedekrankheit auf Winterweizen in 



Oestergötland im Sommer 1918]. (Sveriges ütsädesför. Tidskr. 



XXVIII. p. 195-215. 3 f.) 



XIV. Bacteriologie. 



Allen, E. R. 1919. Some conditions affecting the growth and activi- 



ties of Azotobacter Chroococcum. (Ann. Missouri, bot. Gard. VI, 



p. 1-44. 2 f.) 

 Brew, J. D. and W. D. Dotterrer. 1917. The number of Bacteria in 



milk. (Bull. New York agr. Exp. Stat. Geneva, N. Y. 1917. 439. 



p. 477-522.) 

 Conn, H. J. 1919. Ammonification of manure in soil. (Journ. agr. 



Res. XVI. p. 313—350.) 

 Conn, H. J. 1917. Soil flora studies. I. The general characteristics ot 



the microscopie flora of soil. II. Methods best adapted to the study 



of the soil flora. (Techn. Bull. New York agr. Exp. Stat. Geneva, 



N. Y. 1917. 57. 42 pp.) 

 Conn, H. J. 1917. Soil flora studies. III. Spore-forming Bacteria in 



soil. (Techn. Bull. New York agr. Exp. Stat, Geneva, N. Y. 1917, 



58. 16 pp. 4 f.) 

 Conn, H. J. 1917. Soil flora studies. IV. Non spore-forming Bacteria 



in soil. (Techn. Bull. New York agr. Exp. Stat. Geneva, N. Y. 



1917. 59. 18 pp.) 

 Green, H. H. and N. H. Kestell. 1919. Behaviour of Bacteria towards 



arsenic. (S. afric. Journ. Sc. XV. p. 369—374.) 

 Hunt, N. R. 1919. The „iceless refrigerator" as an inoculation 



Chamber. (Phytopathology. IX. p. 211—212. 1 pl.) 

 Koch, C. P. and J. R. Butler. 1918. Cross-inoculation of legumes. 



(Soil Sc. VI. p. 397—403.) 



