34 Botanisches Centralblatt. 



Blakeslee, A. F. 1918. Unlike reaction of different individuals to 



fragance in Verbena flowers. (Science. 2. XLVIII. p. 298—299.) 

 Blakeslee, A. F. and B. T. Avery Jr. 1918. A vegetative reversion in 



Portulaca. (Brooklyn bot. Gard. Mem, I. p. 18.) 

 Brown, B. S. 1918. Fruiting of appletrees every other year. (Journ. 



of Heredity IX. p. 304—306. 1 f.) 

 Brown, T. W. 1918. Orange-like fruit from a lemon tree. (Journ. of 



Heredity IX. p. 308—310 3 f.) 

 Collins, G. N. 1918. Tropical varieties of maize. (Journ. of Heredity. 



IX. p. 147-154 3 f.) 

 Correns, C. 1918. Fortsetzung der Versuche zur experimentellen 



Verschiebung der Geschlechtsverhältnissen. (Sitzber. preuss. Ak. 



Wiss. 1918. p. 1175—1200. ill.) 

 East, E. M. 1918. Intercrosses between self-sterile plants. (Brook- 

 lyn bot. Gard. Mem. I. p. 141-153.) 

 Harper, R. A. 1918. Organization, reproduction and inheritance in 



Pediastrum. (Proc, amer. philos. Soc. LVII. p. 375-439. 35 f. 2 pl.) 

 Hayes, H. K. 1918. Natural crossing in wheat. (Journ. of Heredity. 



IX. p. 326-330, 334. 2 f.) 

 Hodgson, R. W. 1918. An interesting bud-sport in the Washington 



navel orange. (Journ. of Heredity. IX. p. 301—303. 1 f.) 

 Humbert, E. P. 1918. Nature as a nature-faker. (Journ. of Heredity. 



IX. p. 192. 1 f.) 

 Ikeno, S. 1917. Variegation in Plantago. (Genetics. IL p. 390—416. 2 f.) 

 Jeffrey, E. C. 1918. Evolution by hybridization. (Brooklyn bot. Gard. 



Mem. I. p. 298—305. 1 pl.) 

 Jennings, H. S. 1918. Mechanism and vitalism. (Philos. Rev. XXVII. 



p. 577—596.) 

 Kearney, T. H. and W. G. Wells. 1918. A study of hybrids in Egyptian 



Cotton. (Amer. Nat. LH. p. 491—506. 3 f.) 

 Love, H. H. and W. T. Craig. 1918. The relation between color and 



other characters in certain Avena crosses. fAmer. Nat. LH. p. 



369-383.) 

 Salmon, E. S. 1917. Verbesserung des Hopfens durch Bastardierung 



und Auslese in England. (Intern, agr.-techn. Rundsch. VIII. p. 



999—1001.) 

 White, 0. E. 1915. The crossing of flowers. (Brooklyn bot. Gard. 



Leafl. Ser. 3. Nos 10—11. 111.) 



VI. Physiologie. 

 Cf. IV. Harris. 



Bakke, A. L. 1918. Determination of wilting. (Bot. Gaz. LXVI. p. 



81-116. 5 f.) 

 Beals, C. C. 1918. The effect of aeration on the roots of Zea Mays. 



I. (Proc. Indiana Ac. Sc. 1917 [1918]. p. 177—180. 3 f.) 

 Bernard, C. 1918. Over de physiologische beteekenis van den latex. 



(Teysmannia. XXIX. p. 523-540.) 

 Blaauw, A. H. 1918. Licht und* Wachstum. IIL Die Erklärung des 



Phototropismus. (Med. Landbouwhoogeschool Wageningen. XV. 



p. 89—204. ill.) 

 Burns, G. P. 1918. Weatherconditions and plant development. (Brook- 

 lyn bot. Gard. Mem. I. p. 119—122.) 

 Conner, S D. 1918. The injurious effect of borax in fertilizers on 



corn. (Proc. Indiana Ac. Sc. 1917 [1918]. p. 195—199. 2 f.) 

 tDamm, 0. 1916/7. Die Farbstoffe der Blüten und Früchte im 



Lichte moderner Forschung. (Aus der Natur. XIII. p. 476—482.) 



