CONTENTS. 



LECTURH PAGE 



I. Life from a Physical Standpoint. A. E. DOLBEAR I 

 II. A Dynamical Hypotliesis of Inheritance. J. A. 



RYDER 23 



III. On the Limits of Divisibility of Living Matter. 



]. LOEB 55 



IV. The Differentiation of Species on the Galapagos 



Islands and the Origin of the Group. G. BAUR 67 

 V. The Hereditary Mechanism and the Search for the 



Unknown Factors of Evolution. H. F. OSBORN 79 

 VI. The Embryological Criterion of Homology. E. B. 



WILSON 101 



VII. Cell-Division and Development. J. P. McMuRRicn 125 

 VIII. The Problems, Methods, and Scope of Develop- 

 mental Mechanics. W. Roux 149 



IX. The Organization of Botanical Museums for 

 Schools, Colleges, and Universities. J. M. 



MACFARLANE 191 



X. Evolution and Epigenesis. C. O. WHITMAN . . 205 

 XI. Bonnet's Theory of Evolution. C. O. WHITMAN 225 

 XII. The Palingenesia and the Germ Doctrine of 



Bonnet. C. O. WHITMAN 241 



XIII. Origin of the Centrosome. S. WATASE ... 273 



