CONTENTS. 

 — •<>• — 



LECTURE ^^^^ 



I. Specialization and Organization, Companion Principles 

 of All Progress. — The Most Important Need of 

 American Biology. C. O. Whitman i 



II. The Naturalist's Occupation: i. General Survey. 



2. A Special Problem. C. O. Whitman .... 27 



III. So>ne Problems of Annelid Morphology. E. B. Wilson, 53 



IV. The Gastrcza Theory and its Successors. J. P. 



McMuRRiCH 79 



V. Weismann aud Maupas on the Origin of Death. 



Edward G. Gardiner 107 



V\. Evolution and Heredity. Henry Fairfield Osborn, 130 



VII. The Relationships of the Sea-Spiders. T.H.Morgan, 142 



VIII. On Caryokinesis. S. Watase 168 



IX. The Ear of Man: its Past, Present, and Euture. 



Howard Ayers ^^^ 



X. The Study of Ocean Temperatures and Cur refits. 



William Libbey, Jr 231 



vii 



