756 



THE AMERICAN NATURALIST 



[Vol. XLIV 



in South Dakota was distributed to stations in Kansas and Cal- 

 ifornia. Each year a sample from each station was sent to each 

 of the others and grown there. A similar series of experiments 

 was conducted with Crimean Wheat in Kansas, Texas and Cali- 

 fornia. The results may be briefly stated as follows. 



The same variety of wheat when grown at the same station, 

 no matter what the source of the seed, showed the same charac- 

 teristics, but flic same variety grown at different stations showed 

 marked differences. This result was obtained in the case of 

 both varieties. These results are in entire accord with the 

 results on barley secured by Dr. Albert Mann, who grew pedi- 

 gree seeds of barley at a large number of stations in this coun- 

 try. The original seed was from Svalof. These results have 



The 1 appearance of an English edition of de Vries's "The 

 Mutation Theory" (Vol. I) 11 gives the opportunity for many 

 non-German readers to gain first band knowledge of this re- 

 markable work. It also serves to show the truly wonderful 

 progress that has been made in the study of the phenomena of 

 evolution since this book was originally published (1901-03). 



In reading this book one can not fail to be impressed with 



that in whirl, it is used in -"The 



was Quetelet who first discovered the fact 

 ing variability gives a continuous series 

 in frequency inversely with their magni- 

 tgnitude of a given variation of this kind 

 inary laws of probability. In such varia- 

 leparture from the normal is found. On 



ting ot several pure strains or subspecies, 

 he pure strains gives us a ease of eontinu- 

 )f " fluctuation" about a norm which is 

 i these norms for a large number of pure 



