40 



THE HOLLOW CURVE 



[CH. IV 



climates must have become more differentiated into damper and 

 drier, warmer and colder, etc., than they once were. With them 

 the plants have become differentiated, and it was commonly 

 supposed that this was done, as in the theory of natural selection, 



CANTON VAUD 



Distabution of name THEVENAZ 



•agriculturist ♦commercial or professional -5" Crotx»V' ^'*' 



^ C6.S0O mK ) ♦ ^f 



BalUt 



Kilometres 



Crandson 



j!/ (<2,000lnh 



el 



Orkei 

 (J.SOO inh) 



CANTON VAUD. 



DlstrLbutlon of name ROC HAT 



& po9sibl< varittUi ROJARD, R055AT. RUCHAT 

 • agriculturist. ♦ commercial or professiooa 



o I 1 a fc S t T » < l a 



Kilometres. 





IMONTREUX 



Fig. 6. Distribution of two surnames, Thevenaz and Rochat, 



in French Switzerland. 



more or less in suitability to the various climates, but that the 

 whole specific or other difference appeared, not by gradual 

 adaptation, but at one step. The writer, however, is not prepared 

 to admit that these things are necessarily connected, without 

 further evidence. 



