506 W. Wendler : Physikalische Physiologie 1921—1922 [40 



and Proceed. New Zealand Inst. LIII, 1921, p. 429—432.) — Ref. in Bot. 

 Ctrbl., N. F. I, 1922, p. 349. 



372. Kmulson, L. Cambial Activity in certain Horticultural 

 Plants. (Bull. Torr. Bot. Club XLIII, 1916, p. 533—537.) — Referat in 

 Bot. Ctrbl., CXXXVIII, p. 289. 



373. Oelkers. Kolilensäixre und Jahrring. (Zeitschr. f. Forst- u. 

 Jagdw. LIV, 1922, p. 170—175.) — Ref. in Bot. Ctrbl., N. F. I, 1922, p. 326. 



374. Reiche, K. Zur Kenntnis des Dickenwachstums der 

 Opuntien. (Naturw. Wochensclir., N. F. XXI, 1922, p. 33—40, 7 Abb.) — 

 Ref. in Bot. Ctrbl., N. F. I, 1922 p. 194—195. 



d) Wurzelwachstum 



375. Brenchley, W. E. and Jackson, Violet G. Root development 

 in barley and wheat under different conditions of growth. (Ann. 

 of Bot. XXXV, 1921, p. 533—556, 4 Textfig.) — Ref. in Bot. Ctrbl., N. F. I, 

 1922, p. 105. 



376. Cannon, W. A. On the relation of root growth and deve- 

 lopment to the temperature and aeration of the soll. (Amer. 

 Journ. Bot. 2, 1915, p. 211 — 224.) — Siehe ,, Allgemeine Pf lanzengeograpliie 

 1914—1921", Nr. 283. 



377. Dauphine, A. Sur l'existence de raeceleration provoquee 

 experimentalement. (Bull. Soc. Bot. France 69, 1922, p. 781—785, 3 Text- 

 abbildungen.) — Ref. in Bot. Ctrbl., N. F. II, 1923, p. 419. 



378. Dostäl, R. L'etude experimentale sur la tuberification 

 et la sterilite de la Ficaire. (Vestnik Öeskoslov. Bot. Spolecnosti, 

 Preslia 2, 1922, p. 32—42.) — Ref. in Bot. Ctrbl., N. F. II, 1923, p. 454. 



379. Emerson, F. W. Subterranean organs of bog plants. (Bot. 

 Gazette LXXII, 1921, p. 359—374, 11 Textfig.) — Ref. in Bot. Ctrbl., N. F. I, 

 1922, p. 196. 



380. Gericke, W. F. Protective power against salt injury of 

 large root Systems of wheat seedlings. (Bot. Gazette 74, 1922, p. 204 

 bis 210.) — ^ Ref. in Bot. Ctrbl., N. F. II, 1923, p. 200. 



381. Gerickc, W. F. Certain relations between root develop- 

 ment and tillering in wheat: significance in the production of 

 bigh-protein wheat. (Amer. Journ. of Bot. 9, 1922, p. 366—370.) — Ref. 

 in Bot. Ctrbl., N. F. II, 1923, p. 359—360 



382. Haasis, F, W. Relations between soil-type and root form 

 of western yellow pine seedlings. (Ecology 2, 1921, p. 292 — 303, mit 

 3 Textfig.) — Summary: ,,Observations were made of 268 western yellow 

 pine seedling roots, falling into eight general forms (one transitory), and 

 occurring in five classes of soll in the vicinity of Fort Valley Experiment »Station, 

 Flagstaff, Arizona. It is found that the more clayey the soll the longer is 

 the root and the smaller the ratio between top and root; the more loamy 

 the soil the shorter is the root and the greater the T/R ratio. That is, tbe 

 greater the available moisture the shorter is the root and the greater is the 

 ratio between top and root. This coincides with Weaver's observations. 

 Branching is developed to the greatest extent in cindery soils and least in 

 clayey soils. Latefals are numerous in the laomy-rocky soils, moderately so 

 in stony-clayey and gravelly. Root fans occur as an extreme form of branchiness. 



