668 THE AMERICAN NATURALIST [Vol. XLVI 



affording data from which the variabilities and probable 

 errors might be calculated. It is in part due to the fact 

 that (as will be clear later) the starvation conditions 

 available seem not to have affected seed weight as they 

 did the other characters with which we deal. 



ANCESTRAL SERIES 



COMPARISON SERIES 



The mean weight for both ancestral and comparison 

 series are shown in decimals of grams in Table XXV. 



That seed weight is a character influenced by environ- 

 mental conditions is apparent from the scatter of the 

 means in the ancestral field of Diagram 11 as compared 

 with their closeness to line in the comparison panel. But 



