The Operation of Nutrition and Selection. 541 



of these two cultures: it was dressed with Y:\ of a kilo 

 of dried cow manure and % of a kilo of steamed horn- 

 flour per square meter. This has proved the most satis- 

 factory manure I have tried: plants do not react, in the 

 long run, to larger quantities. 



Otherwise the treatment of the plants was the same 

 as in the former year; they grew healthily; tliere were 

 147 individuals from the long-fruited parentage, and 

 78 from the short-fruited. The fruit lengths were deter- 

 mined in the usual way ; and the numher of plants which 

 exhibited the various fruit-lengths are given in the table 

 on page 540, in which K signifies the offspring of short- 

 fruited and L that of long-fruited parents. 



From the table on page 540 together with result of 

 the sowing of 1891 the following values can be calculated : 

 under S are given the fruit lengths of the seed parents. 



S Q, M Q^ 



Harvest of 1891 — 1.3 25.2 1.5 (Fig. 116^) 



1892. Short fruited culture 20.6 2.5 29.9 2.6 (Fig. 116 ^) 

 1892. Long fruited culture 32.6 2.6 33.4 2.4 (Fig. 116 C) 



and further: 



MINIMUM MAXIMUM 



Harvest of 1891 20 mm. 33 mm. 



1892. Short fruited culture 23 mm. 36 mm. 



1892. Long fruited culture 26 mm. 43 mm. 



We find therefore that the mean fruit-length has in- 

 creased considerably in both cultures of 1892, and that 

 this increase has been more considerable when long- 

 fruited seed-parents have been chosen than when short- 

 fruited ones have. The same is true of the extremes 

 of the crops : fruits as small as those which occurred in 

 1891 did not occur in the cultures of 1892: on the otlicr 

 hand the size of the longest fruits increased consider- 



