572 W. Wendler: Chemische Physiologie 1923—1924 [80 
967. Thoms, H. Die chemischen Inhaltsstoffe der Rutaceen. 
7. Über den weißen Diptam, Dictamnus albus L. (Ber. D. Pharm. Ges. 33, 
1923, p. 68—83.) — Ref. in Bot. Ctrbl., N. F. 2, 1923, p. 426. 
968. Tottingham, W. E., Roberts, R. H. and Lepkovsky, S. Hemicellu- 
lose of apple wood. (Journ. Biol. Chem. 45, 1921, p. 407—-414.) 
969. Traegel, A. Der Invertasegehalt der Zuckerrüben- und 
Mangoldblätter. (Zeitschr. d. Vereins d. deutsch. Zuckerindustr. 1923, 
805. Lief., p. 158—162.) — Ref. in Bot. Ctrbl., N. F.2, 1923, p. 426. 
970. Ultee, A. J. Stickstoffreiche Milchsäfte. (Bull. Jard. Bot. 
Buitenzorg 5, 3. ser. 1923, p. 245—246.) 
Stickstoff 
Trocken- in Trocken- Stickstoff 
Milcehsaft von substanz substanz in Saft 
m, 9% im 9% im 9% 
ISATtocanpUSmUnteoKa@Nensrere 24,09 5,10 11,93 
DEE ANklanıSBto:gicanlamLeSchea er 26,42 5,20 1,37 
3. Broussonetia papyriferaVent... . 36,55 4,49 1,63 
2 JRUEMS. COrlljee Bk 6 oo 00“ 25,76 12,7% 3,28 
5 Jalens erllosea WAlldk sro oo‘ 29,27 14,52 4,25 
971. Ultee, A.J. Kautschukfreie Milchsäfte. (Bull. Jard. Bot. 
Buitenzorg 6, 3. Serie, 1924, p. 264—268.) — In typisch eiweißreichen und 
eiweißarmen Milchsäften ist die Anwesenheit von Kautschuk oder Guttapercha 
nicht unbedingt erforderlich. Absolut frei davon sind die Milchsäfte von 
Broussonetia papyrifera Vent. und Artocarpus elastica Reinw. 
972. Uspensky, EE. Das Mangan in der Pflanze. (Zeitschr. d. 
Moskauer Abt. d. Russ. Bot. Ges. 1, 1922, p. 65—95, Moskau - Petersburg 
[Staatsverlag] 1923. Russisch.) 
973. Ver Hulst, J. H., Petersen, W. H. and Fred, E.B. Distribution 
of pentosans in the corn plant at various stages of growth. 
(Journ. Agric. Research 23, 1923, p. 655—663.) — ‚‚Ihe pentosan content of 
the corn plant varies in different parts of the plant and at different stages 
of growth. From a percentage of 7,4 in the kernel, it increases throughout 
the stages of germination, growth, and reproduction until a percentage of 
31,8 is reached in the cob at maturity. The several parts show minor fluetu- 
ations, but in general there is a steady increase both in the actual weight of 
pentosans and in the percentage of pentosans. During the first 30 days alter 
planting the weight of pentosans increased from 2,2 mg. to 4,1 mg. per 100 plants, 
although there was no increase of drymatter. Pentosans are evidently formed 
from starch or other dry matter. After 30 days there is a very rapid increase 
in both the pentosans and dry matter. Only a trace (0,37 per cent) of methyl 
plutosans was found. Additions of rhamnose to the corn tissue were made, 
and the total pentosans were determined. Although a quantitative recovery 
was not obtained, the weight of phloroglucid soluble in hot alcohol was approxi- 
mately equal to that obtained from both rhamnose and corn tissue separately. 
Free pentoses were found to be present in the corn plant throughout its period 
of growth. They varied from 0,6 to 1,7 per cent of the dry matter. "The maxi- 
mum percentage was found in the stalks at the time when the kernels are 
forming. This is also the time at wich the total sugars reach their maximum. 
A destruction of the pentosans of green corn stover was obtained by pure 
