The American Naturalist 



A Monthly Journal, established in 1867. Devoted to the Advancement of the Biological Science* 

 with Special Reference to the Factor* of Organic Evolution and Heredity 



The Categories of Variation. Professor 8. J. Holmes. 



Zoofojry-Cuenot on the Honey Bee, Professor T. H. 

 Plate on Evolution. V. L. k. 



CONTENTS OF THE JUNE NUMBER 



^ The ^rend^of ^wlo^ca^^piilosophy. Professor 

 The Present Problems of Physiological Plant 

 Ecology. Dr. Burton Livingston. 



Notes and Literature : Notes on Evolution, V. L. K. 

 DeVries's Specie* and Varieties, Dr. George H 

 l^pW^^o^astoniem^f th^F^s^Eg? 



CONTENTS OF THE JULY NUMBER 



Sdectior^nto^ Numbers and^their Use in Breeding. 



P ^tUud? 1C p^fe^ *nd 

 NOt 1f«Uan Heredity 6 JfrVf^fli* CM6 ° f Non " Men - 



The New Flora of Krakatau. Professor Douglas 

 A Male Crayfi^with Some Female Organs. Professor 

 Present Problems in Plant Ecology : 



The Belation of the Climatic Factors to Vegetation. 

 Professor Edgar N. Transeau. 

 Notes and Literature : Recent Experiments on the In- 

 heritance of Coat Colors in Mice, Professor T. H. 

 Morgan. Some Experiments in Breeding Slugs. 

 Professor T. D. A. Cockebell. 



Perur^an ZoologTcal°Prov* Mol, ^* can ^ r i; '* una ot the 



N °^re°S e DA%aD / |^|J < ^- I< * tll y<**«l Notes, 



Are Specie* Realities or Concepts only. Professor J. H. 



with^PoIyprotodonta and Diprotodonta. Pauline 



" The Birth of toteD^nce^^pTO^or^. & Jen- 

 of the Genus Peromyscus, Dr. J. A. Allen, Leo 

 Erkaba, Professor Charles E. Bessey. 



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