xxu 



CONTENl'S 



CHAPTKR XII 



Doubtful Phenomexa of HEREmiY — 



1. ' Xenia ' and telegony ....... 



2. The influence of temporary abnormal conditions of the 



parents on the offspring ...... 



"?. The transmission of diseases ..... 



PAGE 



383 



386 

 387 



PART IV. — THE TRANSFORMATION OF SPE- 

 CIES : ITS ORIGIN IN THE IDIOPLASM 



CHAPTER XIII 



The Supposed Transmission of Acquired Characters — 



1. Difficulties in the way of a theoretical basis for this 



assumption ........ 392 



2. The hypothesis tested by facts ..... 396 



Climatic variation in butterflies 



399 



CHAPTER XIV 



Vari.ation 



1. Normal individual variation ..... 



2. Pathological variation ...... 



3. Summary of the above two sections and conclusions 



4. Variations on a larger scale ..... 



a. The origin of these variations 



b. The transmission of these variations 



410 

 428 

 431 

 435 

 435 

 444 



SUMMARY AND CONCLUSION. 



450 



