314 W. Wendler: Chemische Physiologie 1917— 1919 [58 



must be extended on dynamical principles as is clearly indicated from the in- 

 vestigations of Pantanelli (6). Further it is obviously desirable to work to- 

 wards getting some more explicit principle which will take into account the 

 co-operation of the various activities of the plant. 1t seems clear that at 

 present neither the law of the minimum nor the principle of limiting factors 

 as employed by Blackman in regard to the sub-aerial part of t 1 e plant are 

 expressions of our present knowledge of the life of the plant as a whole. The 

 detachment between plant physiology and agrieulture might be removed if a 

 working principle in regard to the physiological relations of plant processes 

 were evolved which embodied the activities of both sub-aerial and subterra- 

 nean parts of the plant. This is highly desirable, but it must be admitted 

 that it seems far away at present. 



383. Straub, W. Über Digitalis- K u lt u r en. (Arch. d. Pharm. 255, 

 1917, p. 198—204.) - - Ref.. in Bot. Ctrbl. 141, 1919, p. 159—160. 



384. Stutzer, A. Ist Magnesia ein wichtiger Düngestoff? 

 (Berlin, P. Parey, 1917.) - - Ref. in Bot. Ctrbl. 138, 1918, p. 191. 



385. Tengw all, T, A. Über die Bedeutung des Kalkes f ü r 

 die Verbreitung einiger schwedischer Hochgebirgs- 

 pflanzen. (Svensk Bot. Tidskr. 10, 1916, p. 28—36.) — Siehe „Allgemeine 

 Pflanzengeographie 1914— 1921'', Nr. 399. 



386. Thomas, Pierre et Chabas, Andree. Sur le dosage de la 

 tyrosine et des a c i d e s amines libasiques d a n s 1 e s pro- 

 teiques de la levure. (Comt. Rend. Acad. Sei. Paris CLXX, 1920,. 

 p. 1622—1625.) 



387. Tommasi, G. Ricerche e d o s s e r v a z i o n i s u i g u a n i 

 de IIa Sardegna. (Anali R. Staz. chim.-agraria sper. di Roma [2], 9, 

 1917 — 1919, p. 107 — 114.) — In den Lagern von Scala di Gioca bei Sassari 

 findet sich neben dem Guano ein fast reines Phosphat des Kalziums mit den 

 Übergangsstadien von jenem zu diesem. Dieser Guano ist frei von Oxalsäure. 

 Derselbe enthielt 1,45—2,90% Gesamtstickstoff und das Phosphat 35,9—39,0% 

 gesamtes P2O5, und zwar 16,2 — 30,4% in Zitrat löslich. 



A. Borntraeger. 



388. Trommsdori', R. Über die Waehstumsbedingungen der 

 Abwasserpilze Leptomitus u n d Sphaerotilus. ( * 'tibi. f. Bakt., 2. Abt. 

 XLVIII, 1917, p. 62—76.) — Siehe „Pilze 1917", Nr. 744. 



389. Tröndle, A. Über die Permeabilität des Protoplas- 

 mas für einige A 1 k a 1 i d e. (Verhandl. Schweiz. Naturf. Ges.,. 

 KU). Jahresvers., Lugano 1919—1920, IL Teil, p. 113.) 



390. Ulrich, H. E i n f 1 u ß d er Mang a ndüngung auf den 

 Stickstoffgehalt der Zuckerrüben. (Blätter f. Zuckerrübenbau 

 24, 1917, p. 31.) - - Ref. in Ctrbl. Biochem. Biophysik 19, 1918, p. 395. 



391. Watson, W. The bryophytes and lichens of cal- 

 eareous so iL (Journ. of Ecology 6, 1918. p. 189—198.) — Siehe „All- 

 gemeine Pflanzengeographie 1914 — 1921", Nr. 415. 



392. Zeller, S. 31., Schmitz, Henry and Duggar, B. M. S t u d i e s i n 

 the physiology of the f u n g i. VII. Growth of wood- 

 destroying f u n g i on 1 i q u i d m e d i a. (Ann. Missouri Bot. Gard. 6, 

 1919, p. 137 — 442.) ■ — Conclusion: „1. Many wood-destroying fungi are not 

 suitable for growth experiments with liquid media. 2. With respect to the 

 media employed and to the species studied, Merulius pinastri, Polyporus lucidus, 



