The American Naturalist 



A Monthly Journal, established in 1867, Devoted to the Advancement of ^Biological Science! 



E^Jn| M^N^^Stf^^^Jw^^ ^on Trosa 



The inbreedtafc 1 ST^rAiu?3I!^rf nd Heredity m 

 Breeding Experiments with Rata. Professor T. H. 



A MMhMiism for^Organic* Cfcrrelaton?' Professor G. tt 

 Recent Advances in the Study Of Vascular Anatomy 



' ■-' ■ ' • ■ • " \- . : .: ■ 



The^Progress^of Plant^Anatomy^During the Last 

 Shorter Articles and Correspondence: A Note on the 



Ray^vd A Pe\riT ° Pure^todn" C °T 

 Note^^'lfterature ?*He*r~edity-The Nature of " Unit" 



bridofo^*d^Gv^^^^^ 



The Categories of Variation. Professor S. J. Holmes. 

 The General Entomological Ecology of the Indian Corn 



on Growth. Dr. Raymond Pearl. Experimental 

 Zoology— Cuenot on the Honey Bee, Professor T. H. 

 Morgan. The Upholding of Darwin— Poulton and 

 Plate on Evolution, V. L. K. 



CONTENT8 OF THE JUNE NUMBER 



p,r,f,«, : 



CONTENTS OF THE JULY NUMBER 



Selection Index Numbers and their Use in Breeding. 



A C AlKXA U VDER G P^THVEN 17 ^ 0rthO S enesis - ^I. 



Fl ^Ut^^^J^ A S£^ 'g^ 8 ^ 00 and 



Present Problems in Plant Ecology : n^rna. 

 Problems of^Local ^"bution^on A 



Single Number 35 Cents 



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