x Contents 



PAGE 



X. The Influence of Darwin on the Study of 

 Animal Embryology: 



A. SEDGWICK, Professor of Zoology and Compara- 

 tive Anatomy in the University of Cambridge 171 



XL The Palaeontological Record. I. Animals: 



W. B. SCOTT, Professor of Geology in the Uni- 

 versity of Princeton 185 



XII. The Palaeontological Record. II. Plants: 



D. H. SCOTT, President of the Linnean Society of 



London 200 



XIII. The Influence of Environment on the Forms 



of Plants : 



GEORG KLEBS, Professor of Botany in the Uni- 

 versity of Heidelberg 223 



XIV. Experimental Study of the Influence of 



Environment on Animals : 



JACQUES LOEB, Professor of Physiology in the 



University of California .... 247 



XV. The Value of Colour in the Struggle for Life : 



E. B. POULTON, Hope Professor of Zoology in 



the University of Oxford . . . .271 



XVI. Geographical Distribution of Plants : 



Sir WILLIAM THISELTON-DYER .... 298 



XVII. Geographical Distribution of Animals : 



HANS GADOW, Strickland Curator and Lecturer 



on Zoology in the University of Cambridge. 319 



XVIII. Darwin and Geology : 



J. W. JUDD 337 



XIX. Darwin's work on the Movements of Plants : 



FRANCIS DARWIN 385 



XX. The Biology of Flowers : 



K. GOEBEL, Professor of Botany in the Uni- 

 versity of Munich 401 



XXI. Mental Factors in Evolution : 



C. LLOYD MORGAN, Professor of Psychology at 



University College, Bristol .... 424 



