14. General summary. 



Two factors in development — the nature of the 

 idioplasm, and the stimuli affecting it. 



Similarity of parent and offspring due to common 

 origin of germinal idioplasm, and to similar con- 

 ditions of development. 



Changes in conditions affecting germplasm may 

 induce inlieritable variations. 



Balance of evidence favors epegenesis. 



Much still to be learned. 



ERRATA. 



Page 5 add, — Andrews, The Living Substance. Supple- 

 ment to Journal of Morphology, Vol. 12, No. 2, 

 1897. 

 Pages 6, 10, II. For Bovari, ;r«^ Boveri. 

 Page 12. For Young nv?c/ Yung. 

 Page 12 add, — Semper, Animal Life. 

 PouLTON, Colour in Animals. 

 Sachs, Lectures on the Physiology of Plants. 1S87. 



Lecture 39. 

 Davenport, Experimental Morphology. 1897. 

 T. H. Morgan, Development of the Frog's Egg. 



1897- 

 Page 15. For Acclimatisation /yv?^/ Acclimatization. 

 Page 28 add, — Geikie, The Founders of Geology. 1897. 

 Page 29 add, — Bi:di)ari), Te.xt-book of Zoogeography. 



1895. 

 ^^'^'i<^ 35 add, — Bailev, Survival of the Unlike. 

 Page 46 add, — Romanes, Darwin and after Darwin. 



Vol. 3, 1897. 

 Page 47 add, — Lloyd Morgan, Habit and Instinct ; Os- 



IJORN, Organic Selection. American Naturalist, 



November, 1897. 



