43] Wirkungen verschiedener Strahlenarten, z. B. ultraviolettes Licht usw. 617 
455. Esdorn, J. Untersuchungen über Einwirkung von Rönt- 
 genstrahlen auf Pflanzen. (Inaug.-Dissert. Kiel 1924, 30 pp., 7 Textabb., 
13 Tab.; auch Fortschr. a. d. Gebiete der Röntgenstrahlen 33, 1925, 30 pp.) — 
Ref. in. Bot. Ctrbl., N. E. 7, 1926, .p. 3323. 
456. Frik, K. und Krüger, R. Gilt das Arndt-Schulzsche Gesetz 
für Röntgenstrahlen? (Zeitschr. Klin. Med. 99, 1924, p. 264-269.) — 
Rer. in Bot. Etrbl., N. ME. 5, 1925, p. 330. 
457. Harder, R. Über die Bedeutung von Lichtintensität und 
Wellenlänge für die Assimilation farbiger Algen. (Zeitschr. f. Bot. 
15, 1923, p. 305—355, 4 Textabb.) — Ref. in Bot. Ctrbl., N. F. 3, 1924, p. 234 
bis 235. 
458. Herzfeld, St. Die Wirkung von Röntgenstrahlen auf ein 
Moos. (Österr. Bot. Zeitschr. 72, 1923, p. 288--294, 5 Textfig.) — Durch 
Bestrahlung von Leptooryum pyriforme L. mit 1—3 Holzknechteinheiten trat 
eine Stauchung der Achse, dichtere Beblätterung und Trichombildung auf. 
459. Holzknecht, 6. Gibt es eine Reizwirkung der Röntgen- 
strahlen? (Münch. med. Woch. 1923, p. 761—762.) — Enthält theoretische 
Erörterungen. 
460. Hussey, R. G. and Thompson, W.R. The effect of radio- 
active radiations and x-rays on enzymes. 11. The effect of radia- 
tions from radium emanation on pepsin in solution. (Journ. Gen. 
Physiol. 6, 1923, p. 1—-5, 1 Fig.) 
460a. Hussey, R. 6 and Thompson, W.R. The effect of radio- 
active radiations and x-rays on enzymes. III. A unit of measure 
of activity for radium emanation. (Journ. Gen. Physiol. 6, 1923, 
p- 7—11.) 
461. Komuro, H. Studies in the Effect of Röntgen Rays upon 
the Development of Vicia faba. (Journ. Coll. Agric. Tokyo 8, 1923, p. 253 
bis 292, pl. XI—XII and one Textfig.) — Die Versuche des Verf. brachten 
folgende Ergebnisse: ‚‚l. Though the seeds are exposed to Röntgen rays of 
high dose, their development is not stopped immediately. They germinate 
and develop for a certain period. — 2. Though the impediment of growth is 
caused by the dose which is inversely proportional to the water content of 
seeds, the injured plants cease to develop at almost the same stage of growth 
under the ground. There is no difference in growth proportional to the doses 
given (when the steeped seeds contain same amount of water by steeping). — 
3. When the dose of Röntgen rays exceeds a certain limit, it does not induce 
a visible difference in the state of impediment proportional to the dose. The 
effect of Röntgen rays in these cases is no more than an injurious stimulation 
for the seeds — of course, this limit varies with the water contents of the 
seeds at the time of irradiation.‘ Eirsrledde 
462. Komuro, H, Studies in the Effect of Röntgen Rays upon 
the Germination of Oryza sativa. (Bot. Mag. Tokyo 38, 1924, p. 1—20, 
15 Tab.) — ‚1. The germination of air-dried seeds and of steeped seeds was 
accelerated by the irradiation of X-rays. 2. The acceleration of germination 
is obviously shown in the seeds X-rayed in the air-dried condition, and. the 
dose of 5 H — 10 H seemed to be an optimum. 10H especially showed an 
evident acceleration of germination. 3. In the further growth after germination, 
plants grown from the seeds irradiated after 12 hours’ steeping were Worse 
than plants grown from the seeds X-rayed in the air-dried condition. In the 
Botanischer Jahresbericht LII (1924) [Gedruckt 25. 9. 33] 40 
