488 Physiologie. — Palaeontologie. — Eumycetes. 



Strahls zu liegen. Durch Verssuche wurde festgestellt dass die 

 Schutzstellung bloss durch das directe Sonnenlicht ohne Mitwirkung 

 von zerstreutem Tageslicht erfolgt. 



Am Schluss geht der Autor auf die sogenannten pan- und 

 euphotometrischen Blätter ein. Th. Weevers. 



Knowlton, F. H., Descriptions of Fossil Plauts from the 

 Mesozoic and Cenezoic of North America. I. (Smithson. 

 misc. Coli. LH. pt. 4. p. 489-496. pl. 63, 64. Jany. 1910.) 



1. Two New Fossil Chain-ferns {Woodwardia) from Oregon 

 and Wyoming. 



2. A New Name for DavalUa temiifolia Swartz, as identified by 

 Dawson, and Asplenium tenenini Lesquereux. 



The author describes in the first part of this paper two remark- 

 ably preserved new species of Woodwardia both of which have 

 their fructifications well preserved on some of the specimens. One 

 is from the Fort Union Eocene of Wj'-oming and the other 

 from the Pleistocene of Oregon. 



In the second part of the paper new and well preserved material 

 showing the fructifications enable the author to refer to the Single 

 new species Dennstaedtia antericana the form from Saskatchewan 

 which Dawson referred to DavalUa tennifolia Swartz and the 

 Asplenium tenerurn of Lesquereux from the Fort Union Eocene 

 of North Dakota. Berry. 



Wieland, G. R., The Williamsonias ofthe Mixteca Alta. (Bot. 

 Gaz. XLVIII. p. 427—441. f. 1 — 10. Dec. 1909.) 



This paper is devoted to a brief account of the authors fieldwork 

 in search of fossil plants in the State ofOaxaca, Mexico and to 

 speculations regarding the ancestors of the Angiosperms. The author 

 brings forward a number of additional arguments in support of his 

 views that the Angiosperms are descended from the Cycadophytes 

 through the Williamsonias and the gamopetalous Dicotyledons as 

 typified by Magnolia or Liriodendron. Berry. 



Wieland, G. R., Two new Araucarias from the western 

 Cretaceous. (Bull. 4. Rept. Geol. Surv. S. Dakota, for 1908. p. 

 77—81. f. 1, 2. 1910.) 



This paper is devoted to a description of a new species of 

 Araucaria founded on a silicified fragment of a cone from an un- 

 known, probably Upper Cretaceous, horizon in South Dakota; 

 and a second species founded on foliage found in the Ceratops beds 

 of Wyoming. Berry. 



Kochmann, M., Der Einfluss des Aethylalkohols auf die 

 Hefegärung. (Biochem. Ztschr. XVI. p. 391—398. 1909.) 



Unter Benutzung des von H. Schulz angegebenen graphisch 

 registrierenden Gärungsapparates war es möglich festzustellen, dass 

 Zugabe einer geringen Konzentration Alkohol die Hefegärung gün- 

 stig beeinfiusst. Am günstigsten erwies sich eine Konzentration 

 von 1:300 bis 500. Verf. nimmt an, dass der Alkohol im günstigen 

 Falle eine Beschleunigung der Fermentproduktion bewirkt, nicht 

 aber die Zymase selbst beeinfiusst. K. Snell (Bonn). 



