MAIZE BREEDING 



193 



Chemical Composition. The classical selection experiments 

 of the University of Illinois for the purpose of isolating high and 

 low protein, and high and low oil strains, are well known. They 

 prove conclusively that strains differing in chemical composition 

 may be isolated by selection. Table XLI gives the results for 

 15 years' selection. This information was obtained through the 

 kindness of Professor L. H. Smith. 



Progress during the latter years of the experiment has not been 

 so rapid as during the early years, which is probably because the 

 genetic limit for high and low protein and high and low oil pro- 



TABLE XLI. A. RESULTS OF SELECTING MAIZE FOR HIGH AND FOR Low 



PROTEIN CONTENT RESPECTIVELY 

 Average Percentage Protein in Crop Each Generation 



13 



