470 



CORN 



percentage of germ in the low oil corn. These results are very apparent 

 in the table which gives this data. 



EFFECT OF BREEDING ON COMPOSITION OF GERMS 

 AND ENDOSPERMS. As already explained, lo ears were selected 

 for each of the four different strains of corn, low protein, high protein, 

 low oil and high oil, and 25 kernels were taken from each of the 40 

 ears, the germ being separated irom tne rest of the kernel, which we 

 call endosperm. After the percentage of germ was determined for each 

 individual ear, the germs from each lot of 10 ears were put together 

 to make 2 samples, each sample representing 5 ears. The endo- 

 sperms were likewise put together, so that we had duplicate samples 

 of both germs and endosperms for each of the 4 different strains. 

 These samples were analyzed chemically and the results are given in 

 the following table: 



CHEMICAL COMPOSITION OP GERMS AND ENDOSPERMS PROM LOW 



PROTEIN AND HIGH PROTEIN CORN AND PROM LOW OIL 



AND HIGH OIL CORN. 



"The results show in a very striking manner the effect of breeding 

 in changing the composition of the different physical parts of the ker- 

 nels. Thus, the germs from the low oil corn contain about 25 per cent 

 of oil, while those from the high oil contain nearly 42 per cent of oil. 

 As stated above, breeding to change the oil content not only changes 

 the percentage of germ, but it also changes the percentage of oil in the 

 germ. It should also be noted that endosperms from the high oil corn 

 contain about twice as much oil as those from the low oil corn, al- 

 though the percentage of oil is very small, even in the low oil corn, 

 and this oil is largely contained in the horny gluten."* 



Perhaps the most marked and valuable results are shown in the 

 percentages of protein contained in the endosperms from low protein 



•Bulletin 87 of Illinois. 



