TRANSLATOR'S PREFACE 



de novo at a post-embryonic period of life, those which are 

 acquired, and those which are due to variations of the 

 germ -plasm ? There is none ; and therefore it would be 

 as true to assert that there is no evidence of the inheritance 

 of any individual variations, as to say there is no evidence 

 of the inheritance of acquired variations. 



J. T. CUNNINGHAM. 



PLYMOUTH, 31st January 1890. 



