VOL. XLI, NO. 492 



BECEMBEE, 1907 



THE 



AMERICAN 

 NATURALIST 



A MONTHLY JOTJRNAL 

 DEVOTED TO THE NATURAL SCIENCES 

 DJ" THEIPv WIDEST SENSE 



CONTENTS 



I. Preliminary Notes on Some American Chalicotheres . . 0. A. PETETISON 783 

 II. Observations on the Natural History of Polyodon spathula 



CHASLES F. STOCKASD 763 

 III. Fo-arler's '* Heterognathous Fishes " with a Note on the Stethaprioninae 



C. H.*^EIGENMANN 767 



IV. Pink Insect Mutants WILLIAM M. WHEELEB 773 



V. Notes and Literature : General Biology; The theorj' of mimici^'.-— The inherit- 



ance of disease.— Malaria in ancient Greece and Rome.— The distribu- 

 tion of European animals.— The dancing mouse. Zoology; Ichthyo- 

 logical notes.- Notes on the structure of insects.— British rhizo|x>ds. 

 Botany ; Recent studies on gymnosperms.— Xerophiiy of the gj-mno- 

 sperms. — Notes on the problem of adaptation.— Plant cultivation in 

 art and education.— Lobed terminal leaflets in the rose. . . . 781 



VI. Publications Beceived 818 



BOSTON, U. S. A. 

 GINN & COMPANY, PUBLISHERS 

 29 BEACON STREET 



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