VOL. XLI, NO. 491 



NOVEMBEE, 1907 



THE 



AMERICAN 

 NATURALIST 



A MONTHLY JOUENAL 

 DEVOTED TO THE NATURAL SCIENCES 

 IN THEIR "WIDEST SENSE 



11. Further Notes c 

 Pleistocene Plai 



CONTENTS 



-HmiiH • • S.A. COITHTIS 677 



or of Gonionemus ■ MAX MOHSE 683 



jama • ■ EDWAED W. BEEEY 689 



Vf lF«;rerStud7oVrerf Development • • -"^^^f'^^^^^l !J} 



V. Earthworms as Planters of Trees ^-n^'J^irnSJT^ ^11 



VI. The Canse of Gynandromorphism in Insects . . T H. MORGAN 716 

 VII. Notes and Literaluie G^'r B o'o , ^^ ' f'" !> ont m the rhild and 



the ra(v ' -"^edg^Mcks Phy^i- 



oion-v Z : '.■ite.s.— The sense of 



jLvl,'— ' ' "^e the prairie-dog 



BOSTON, XJ. S. A. 

 GINN & COMPANY, PUBLISHERS 

 29 BEACON STREET 



