CEREAL ADAPTATION AND ASSOCIATION 295 



temporary. California seed taken to Kansas produced 

 wheat with high protein, but seed of that wheat returned 

 to California the next year, produced kernels with the 

 same low protein as that of the original California seed 

 (Le Clerc and Yoder, 1914). Extensive investigations 

 of Thatcher (1913) gave results similar to these just 

 described. 



318. Cumulative effects in long periods. Many 

 agricultural experiences, including the instance of the 

 acclimatization of Swedish Select oat (312), appear to 

 demonstrate the cumulative effects of environment in 

 long periods of time. Lyon (1907) has brought together 

 and interpreted such instances from various sources. 

 Two of these instances show an apparently cumulative 

 effect upon earliness. Seed originally of the same variety, 

 but afterward long grown at different points, when planted 

 in Nebraska, produced plants which ripened at widely 

 different dates, corresponding to the dates of ripening in 

 their different native localities. Usually the crop from 

 southern or western seed ripened earlier. The crops from 

 seed of all sources, after several years in Nebraska, grad- 

 ually came to ripen at the same time. While a change of 

 seed, as ordinarily understood, is not to be recommended, 

 the importation of seed, even of the same variety, from a 

 very different district where it has been long and contin- 

 uously grown, is likely to prove advantageous, if the 

 crop in that district is known to be of better quality than 

 in the locality where it is to be taken (see 314). A good 

 example was the Kansas millers' importation of new 

 Turkey wheat seed from the Crimea in 1901. 



