Bd. XCIX. No. 8. XXVI. Jahr.gang. 



Botanisches Centralblatt 



Reierirendes Ori^-an 



der 



Association Internationale des Botanistes 



für das Gesammtgebiet der Botanik. 



Herausgegeben unter der Leitung 

 des Präsidenten : des Vice-Präsidenten : des Secretärs : 



Prof. Dr. R. v. Wettstein. Prof. Dr. Cli. Flahault. Dr. J. P. Lotsy. 



und des Redactions-Commissions-Mitglieds: 



Prof. Dr. Wm. Trelease. 



von zahlreichen Specialredacteuren in den verschiedenen Ländern. 

 Dr. J. P. Lotsy, Chefredacteur. 



No. 34. 



Abonnement für das halbe Jahr 14 Mark 



durch alle Buchhandlungen und Postanstalten. 



1905. 



Alle für die Redaction bestimmten Sendungen sind zu richten an Herrn 

 Dr. J. P. LOTSY, Chefredacteur, Leiden (Holland), Rijn-en Schiekade 113. 



Clements, F. S., Research Methodsin Ecology. (Univ. 

 Pub. Co. Lincoln, Nebraska 1905. XVII, 334 pp. 85 iig.) 



As the preface states this work is intended for a handbook 

 for investigators and advanced students in ecology, and is not 

 a text-book. From this standpoint it is very comprehensive, 

 containing füll descriptions of the instruments employed, their 

 use, the recording and plotting of data, the kinds and structure 

 of the varioLis ecological formations etc. Examining the volume 

 more in detail we may give the approximate content by chapters. 



Chapter I. has to do with the history of the subject, its 

 relation to other branches of botanical investigation, and its 

 general application to other theoretical and practical fields. In 

 the following chapter after a consideration of the factors invol- 

 ved in ecological research we find a complete account of the 

 instruments, automatic and otherwise which are employed. 

 Included in this are instruments called the selagraph, a simple 

 automatic photometer, and trechometer for measuring the effect 

 of slope on the ..run-off" water. 



Chapter III. deals with the plant itself, the Stimuli which 

 affect it and its response thereto. Especial attention is given 

 to response to water and light Stimulus, called respectively 

 hydro-harmose and photo- harmose. A section at the end 

 is entitled, „Experimental Evolution". 



Chapter IV. entitled „The Formation" includes the rest of 

 the book and is naturally owing to the complexity of the topic 

 much the longest, including, indeed, about half of the work. 

 After insisting on the need of exact investigation, the quadrat 



Botan. Centralbl. Bd. XCIX. lOOS. 12 



