INHERITANCE 239 



foundation of all theories of descent, as we shall see in the 

 next lectures. " Mutations " are known to exist at present 

 only among some domesticated animals and plants. Nothing 

 of a more general character can be said about their law or 



meaning. 1 



1 H. de Vries, Species and Varieties : their Origin by Mutation, London, 

 1905. A short review of the "mutation-theory" is given by France in 

 Zeitschrift /. d. Ausbau d. Entwickelungslehre, i. 1907. It is well known 

 that Gautier, and, in the first place, Korshinsky, advocated a similar view 

 previous to the authors named in the text. 



