VOL. XLI, NO. 487 



THE 



JULY, 1907 



AMERICAN 

 NATURALIST 



A MONTHLY JOURNAL 

 DEVOTED TO THE NATURAL SCIENCES 

 IN THEIR WIDEST SENSE 



CONTENTS 



ennial. Eemarksby CHARLES W. ELIOT 413 



jf a New Species of Telenomus with observations on its Habits 



nd Life His 



ffiOREILL 417 



III. The Development of Pinnate Leaves . . . • • FREDEBIC T. LEWIS 431 



IV. Contributions to the Pleistocene Flora of Canada . D. P- PENHALLOW 443 

 V. Significant Results of a Decade's Study of the Tunicata. WILLIAM E. BITTER 453 



VI. Notes and Literature : General Biology ; The A|assiz Centenmal.— llie pre- 



Stone-gatherSg fishes. Botany: The search for mutations.- Biology 



in the Journal of Agricultural Science. -^otes 461 



Vn. PubUcations Received 



BOSTON, U. S. A. 

 GINN & COMPANY, PUBLISHERS 

 29 BEACON STREET 



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