534 Length of the Fruit in Oenothera Lamarckiaiia. 



a matter of fact, almost without exception considerably 

 larger. 



With a view to studying the correlation between indi- 

 vidual strength and length of fruit^ I also measured, on 

 the same 38 plants, the length and thickness of the stem 

 and the thickness of the fruits. The thickness of the 

 stem was measured just above the root and round the 

 lowest fruit-bearing internode. The length of the stem 

 was complicated by other factors ; the plants which came 

 up late were abnormally elongated because the light was 

 kept off them by their taller neighbors. I shall therefore 

 not deal further with this character. 



The data are summarized in the table below. This has 



CORRELATION BETWEEN THICKNESS OF STEM AND LENGTH 

 OF FRUIT IN OENOTHERA LAMARCKIANA. 



^ The method of measuring and estimating correlations between 

 variable organs was originated by Galton. See Correlations and 

 their Measurements. Proc. Royal Soc., Vol. 45, (1888), p. 135. See 

 also Galton, ibid., Vol. 40, p. 42 and Weldon, ibid., Vol. 51, (1892), 

 page 3. 



