444 



TRANSMISSION 



SECTION V COMPARATIVE TYPE AND VARIABILITY 



FOR DIFFERENT CHARACTERS IN THE SAME 



POPULATION 



If a variety of characters in the same population be critically 

 studied it will be found that each has its own type and variability. 

 For example, in the population arising from the ten-inch ears 

 already discussed it was found that other characters varied as 

 follows : 



TYPE AND VARIABILITY FOR FOUR CHARACTERS OF CORN GROWN FROM 

 SEED EARS TEN INCHES LONG 



From this we see that each separate character takes its own 

 type and variability. For example, corn is much more variable 

 as to weight (24.82 per cent) than as to any other character 

 measured. This is to be expected, because weight is to some 

 extent the resultant of both length and circumference and would 

 thus partake of the variability of both. But we note also that 

 this corn at least was much more variable as to length than as to 

 circumference (14.53 P er cent as compared with 8.06 per cent). 



Again we note that these ears are much more variable as to 

 number of rows than as to circumference, by which we infer 

 that the width of the kernels is far from uniform, else the two 

 would move together. 



This raises the whole question of the relation or bond between 

 different characters, a subject to be discussed in the succeeding 

 chapter on " Correlation." It is sufficient here to remark that 

 the typical ear of this crop of corn is 8.829 inches long, 7.047 

 inches in circumference, has 20.09 rows of kernels, and weighs 

 12.75 ounces. If we should pick such an ear it could stand as 



