Floristik, Geographie, Systematik etc. 475 



Valley and on its precipitous sides and finally the associate spe- 

 cies seen in the Wawona bigtree grove. Harshberger. 



Dachnowski, A., The Vegetation of Cranberry Island 

 (Ohio) and its Relations to the Substratum, Tempera- 

 ture and Evaporation. (Bot. Gaz. LH. p. 1—33, 126-150. Julv 

 and Aug. 1911.) 



The author after preliminary remarks describes the habitat as 

 that of Buckeye Lake, Ohio and with this description an ana- 

 lysis of peat specimens from Cranberry Island is given in tabu- 

 lar form. A chemic analysis of the substratum is added, as also a 

 consideration of such topics as the reducing action of peat soil, the 

 Physiologie properties of bogwater, the bacterial flora of the peat 

 substratum. Dachnowski then describes the origin of the habitat 

 and the flora recognizing the border zone, the maple-alder zone 

 and the central zone. In the second part, the ecologic factors are 

 considered. In determining, the evaporation element a porous cup 

 atmometer was used. The author believes, as a result of his in- 

 vestigations, that the functional activity of the plants is not one of 

 relation to a Single factor for in the interrelation of conditions the 

 real limiting factor to an increase in functional activity is not eva- 

 poration or temperature, but the toxicity of the substratum. 



Harshberger. 



Füller, G. D., Evaporation and Plant Succession. (Bot 

 Gaz. LH. p. 193—208. Sept. 1911.) 



The records on investigation of the Vegetation of the sand dunes 

 of Lake Michigan by means of the forms of atmometer devised 

 by Livingston and Transeau. The results are tabulated by 

 means of graphic curves. The author concludes by stating that in 

 such determinations the true measure of the limiting atmospheric 

 factors must be found either in the demand throughout the entire 

 growing season as expressed in the average evaporation rate for 

 that period, or in a maximum demand of several days, duration 

 oecurring at a period when the water-supply in the soil is deficient, 

 such as would be expressed in a high rate continuing for a week 

 or more in the latter part of the summer. Harshbergen. 



Harper, R. M., A Quest for the Wakulla Volcano. (Florida 

 Review VI. p. 215—224. Sept. 1911.) 



This paper describes an unsuccessful search for a legendary 

 volcano which emitted smoke in the impenetrable swamps of the 

 Gulf Coast of Florida in Wakulla County. Incidentally the 

 character of the swamp Vegetation is mentioned as seen on the trip 

 to discover this curious phenomenon. Harshberger. 



Harper, R. M., Early Spring Aspects of the Coastal 

 Piain Vegetation of South Carolina, Georgia and 

 northeastern Florida. (Bull. Torrey bot. Club. XXXVIII. 

 p. 223—236. June 1911.) 



Phenologic observations made en route from Washington, 

 D. C. to Jacksonville, Fla., with lists of species observed. 



Harshberger. 



