422 Physiologie. — Fungi. 



Gelingt es, diesen osmotischen Druck herabzusetzen, so muss 

 die Widerstandsfähigkeit verloren gehen. Um diese Theorie zu 

 prüfen, bearbeitet Verf. Hefe mit hypertonischen Lösungen von 

 Salpeter, Kochsalz oder Glycerin, welche an und für sich un- 

 schädlich wirken und setzt sie dann der Abkühlung durch 

 flüssige Luft aus. Das Leben zeigt sich verloren. 



Tswett (Petersburg). 



Gardner, Blanche, Studies onOrowth and Cell Division 

 in Vicia Fciba. (Publications of the Univ. of Pennsylvania. 

 Contributions from the Botanical Laboratory. Vol. IL No. 1. 

 p. 150—182. Fl. 18. 1901.) 



The conclusion is reached that the rate of growth of the 

 root is greater by day than by night, a conclusion directly 

 opposed to the view of Sachs that growth is more rapid at 

 night. 



From a study of the roots of the pea, bean and corn, 

 grown in asbestos and moistened with Solutions of HCl, Na Cl 

 and (NH4)2 CO3, the writer concludes that at a certain strength 

 the Solutions are nutritive and accelerate growth: stronger So- 

 lutions retard growth, acting as toxins; between the two a 

 strength may be found which is neutral in its effects. 



A large part of the paper is devoted to a discussion of 

 the relation between the nucleolus and chromatin. The trans- 

 ference of nucleolar material to the spirem thread and the 

 building up of the nucleolus from chromatin during telophases 

 is traced in some detail. No more importance should be 

 attached to the chromosomes as bearers of hereditary qualities, 

 than to the nucleolus. Charles J. Chamberlain. 



Kny, L., Ueber die Bedeutung des Blattgrüns für das 

 Pflanzenleben. (Naturwiss. Wochenschr. 1901.) 



Allgemeinverständliche Besprechung der Chloroplasten, des 

 Chlorophylls, des Etiolement und des Assimilationsprocesses. 



Küster. 



Howard, Albert, The FungoidDiseases of Cacao in the 



West Indies. (West Indian Bulletin. IL 190—211. 1901.) 



The author describes a number of pod, stem and root diseases of 

 cacao, giving a description of the general and microscopic characters of 

 the fungi causing these diseases, together with accounts of infection 

 experiments and remedial measures. The fungi considered are: Dlplodia 

 cacaoicola P. Henn. causing the „Brown Rot" of the pod; Phytoplitliora 

 omnivora De Bary and Nectria Bainii Massee, causing other pod disseases. 

 Nectria ditissima causes the „canker" disease of the stem; Exoascns 

 Theobromae Ritz. Bos. causes the united broom disease of Surinam. A 

 Bibliography containing 35 titles is added. von Schrenk (St. Louis). 



Howard, Albert, n Dlplodia cacaoicola P. Henn. (Ann. of 



Botany. XV. p. 683. 1901. PI. 37.) 



The author describes at length the growth and morphology of 

 Dlplodia cacaoicola a fungus causing a disease of sugar cane and cacao 



