Floristik etc. — Pflanzenchemie. 75 



Livingston, B. E. and F. Shreve. The relation between 

 climatic conditions and plant distribution in the Uni- 

 ted States. (Johns Hopkins Univ. Circ. p. 19—20. Feb. 1912.) 



The paper epitomizes the general results obtained by an elabo- 

 rate compilation and calculation of the available data on climatic 

 conditions and plant distribution in the United States, the ranges 

 of the main vegetational types and the climates of the areas covered 

 by these ranges. The füll details with maps and Charts will appear 

 subsequently. Harshberger. 



O'Byrne, F., A Woodlot .Survey in Oxford Township, 

 Bulter County, Ohio. (Miami Univ. Bull. Ser. X. ll.July 1912.) 



A Chart of the areä is given and mention is made of the most 

 important trees of each woodlot in the area. From these facts the 

 following Classification of woodlots is adopted: the pastured, the 

 second growth hickory, the unpastured, the hopeless, the young 

 growth. Methods of cutting and thinning and general recomman- 

 pations are considered. Harshberger. 



Scherff, E. E., The Vegetation ofSkokie Marsh, with spe- 

 cial reference to subterranean organs and their in- 

 te r r e 1 a t i o n s. (Bot. Gazette. Uli. p. 415—435. Fig. 1 — 10. May 1912.) 



Skokie Marsh is intimately associated with Skokie stream 

 which begms at Wankegan 111. and extends southeast to a point 

 west of Glencoe, 111. The general features of the marsh Vegeta- 

 tion are described and the plants are found either in a reed swämp. 

 or a swamp meadow. The ecologic factors are given, as determined 

 by atmometers, by water depth measurements, etc. The bulk of the 

 paper is devoted to a consideration of the distribution and structure 

 of the subterranean organs, illustrated by six plates. An interesting 

 conclusion is reached that two or more species may live together 

 in harmony because 1) their subterranean Organs may be at diffe- 

 rent depths; 2) their roots thus may be produced at different depths; 

 3) even where roots are produced at the same depth, they may make 

 unlike demands upon the soil; 4) the aerial shoots may have unlike 

 growth-forms; or because, 5) ,even where these growth forms are 

 similar, the}^ may vegetate chiefly at different times of the j'-ear. 



Harshberger. 



Euler, H. und S. Kuliberg. Ueber das Verhalten freier und 

 an Protoplasma gebundener Hefenenzyme. (Zschr. 

 physiol. Chemie. LXXIIL 1/2. p. 83—100. 7 Kurven. 1911.) 



In Bezug auf Wirksamkeit, Löslichkeit und Verhalten gegen 

 anästhetisierende Mittel bestehen zwischen den kohlenhj^dratspal- 

 tenden Hefenenz3'men, der Zymase (im weiteren Sinne), der Maltase 

 und der Invertase erhebliche und anscheinend sehr wesentliche 

 Unterschiede. Verff. geben zunächst eine Zusammenfassung der in 

 der Literatur beschriebenen und aus neuen eigenen Versuchen sich 

 ergebenden, hierhergehörenden Tatsachen und suchen dann zu 

 zeigen, dass die Versuchsergebnisse, welche hinsichtlich dieser drei 

 Enzyme vorliegen, sich von einem gemeinsamen Gesichtspunkt aus 

 darstellen lassen. Auf Einzelheiten kann nicht eingegangen werden. 

 Die über die Hefenenzymen mitgeteilten Tatsachen werden durch 

 folgende erweiterte Arbeitsh3^pothese zusammengefasst: 



