CONTENTS xi 



LECTURE X 

 HEREDITY 



PAGE 



1. The Hereditary Effects of the Spermatozoon and Egg The Prevailing Influence 



of the Egg in the Early Stages of Development Merogony Toxicity of 



the Blood of Forms not closely Related Mendel's Experiments . . .179 



2. The Determination of Sex and the Secondary Sexual Characters .... 186 



3. Egg Structure and Heredity . . . . . . . . . . . 191 



LECTURE XI 



ON THE DYNAMICS OF REGENERATIVE PROCESSES 



1. Sachs's Hypothesis of the Formation of Organs 199 



2. Heteromorphosis and Regeneration in Tubularia ....... 2OI 



3. Regeneration in an Actinian {Cerianikus membranaceus) ..... 207 



4. Regeneration and Heteromorphosis in Planarians . . . . . . 210 



5. On the Influence of the Central Nervous System upon Regeneration and on Phe- 



nomena of Correlation in Regeneration ........ 213 



6. The Effect of Some External Conditions upon Regeneration and the Transforma- 



tion of Organs . . . . . . . . . . . .217 



7. The Role of Reversible Processes in Phenomena of Regeneration The Distribu- 



tion of the Power of Regeneration in the Animal Kingdom . . . .218 



LECTURE- XII 

 CONCLUDING REMARKS 223 



INDEX 227 



