VOL. XL, NO. 474 



JUNE, 1906 



THE 



AMERICAN 

 NATURALIST 



A MONTHLY JOUIINAL 

 DEVOTED TO THE NATURAL SCIENCES 

 IN THEIR WIDEST SENSE 



CONTENTS 



Page 



I. Observations and Experiments on Dragonflies in Brackish Water K. C. OSBURN 395 

 II. Reactions of ru6H/ar/a crocea (Ag.) ...... A- S. PEAESE 401 



in. Pressure and Flow of Sap in the Maple . . . • DB. K. M. WIEGAND 409 



IV. Notes and Literature : Teaching, MeMurry's Special Method in Elemoiitary 

 Science; Evolution, Lotsy's Theories of Descent; Exploration, Scott s 

 Voyage of the ' Di.scovery ' ; Botany, Harris on Anther Dehiscence. 

 Freeman's Minnesota Plant Disea.«es, Ward's Flowers of English Trees 

 and Shnibs, Notes, The Journals 456 



BOSTON, U. S. A. 

 GINN & COMPANY, PUBLISHERS 

 29 BEACON STREET 



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London, W. 0. 



