VOL. XL, NO. 469 



JANUARY, 190* 



THE 



AMERICAN 

 NATURALIST 



A MONTHLY JOURNAL 

 DEVOTED TO THE NATURAL SCIENCES 

 IN THEIR WIDEST SENSE 



CONTENTS 



I. Flying-fish Flight, and an Unfixed Law of Nature LT. COL. C. D. DUENPOED ^ 



II. Double Hens' Eggs PROFESSOE 6. H. PAEKEE 18 



m. Biological Eolations of Certain Cacti .... DB. W, A. CAlOfON 27 

 IV. Contribntions to the Physiology and Biology of the Dugong 



PEOFESSOE H. DEXLEE AND L. FSEUHD 49 



Correspondence: t'ongress of Oceanographers ■ . . . • 73 



BOSTON, U. S. A. 



GINN & COMPANY, Publishers 



29 BEACON STREET 



London, W. C. 



