

TYPE AND VARIABILITY 



447 



SECTION VII INDIRECT EFFECTS OF SELECTION UPON 

 TYPE AND VARIABILITY 



In the table just given we noted only the direct effects upon 

 the character undergoing selection. It now remains to consider 

 how rigid selection of one character may affect other and pre- 

 sumably correlated characters. To this end we construct a 

 table showing the physical characters of the four strains of 

 corn now under discussion, remembering that these strains all 

 developed from the same original stock and that selection was 

 confined to the chemical characters, protein and oil, leaving the 

 physical and physiological characters free to take care of 

 themselves. 



INDIRECT EFFECTS OF SELECTION : RESULTS OF SEVEN YEARS' SELEC- 

 TION FOR CHEMICAL COMPOSITION UPON PHYSICAL CHARACTERS. 

 ALL FOUR STRAINS DEVELOPED FROM THE SAME ORIGINAL STOCK l 



Discussion of data. A critical study of this table reveals 

 some significant facts concerning the indirect effects of selection 



1 See Bulletin No. 7/9, University of Illinois Agricultural Experiment Station. 



