No. 613] EXPERIMENTS CONCERNING EVOLUTION 29 



2. The Melanism of the Nun-moth, Lymantria mo- 

 nacha.— The nun is one of the moths which have devel- 

 oped melanic varieties within recent times; and these 

 melanic varieties, which were extreme rarities not many 

 decades ago, have almost supplanted the original white 

 form. We have worked out the genetics of this case and 

 shall publish the details when conditions permit. Some 

 of the results were read before the German Zoological 

 Society in 1911 but no abstract was published. 



3. The Genetics of Alpine Varieties, especially of 

 Parasemia plantaginis and the Italian Races of Calli- 

 morpha dom inula. — This work has been broken off by the 

 war, but some of the first results are available. 



We shall begin with a few facts concerning the geo- 

 graphic variation of the gypsy-moth. We have here a 

 form that is spread all over Europe, through Siberia into 

 China, and all over Japan, infesting, furthermore, part 



of the Atlantic coast of the United States. We have 

 studied races from different parts of Europe and Japan 

 and the Massachusetts form and we have found different 

 forms in comparatively near-lying regions. Thus the 

 races from the Rhineland, Silesia and Hungary are dif- 



