W00DH0USE AND TAYLOR. 



119 



From this we see that in 1910 the black seeded variety 

 showed a tendency to group round the high nitrogen values 

 while the yellow and chocolate varieties, although nearly equal to 

 one another, were far below the black. 



The actual means were as follows : — 



The fluctuations from the mean were extremely small. The 

 standard deviation was about + '3 and the probable error of a 

 single sample was therefore about + "2. 



Actual examination of the results obtained showed the 

 following : — 



It has been mentioned that in lpil we were able to deter- 

 mine the oil contents of each type of seed. For this purpose 

 about 70 plants of each kind were taken at random and their 

 oil content was determined. In this case it was found that the 

 yellow and chocolate coloured varieties were by far the greatest in 

 oil content, while the black seeds were in nearly every case far 

 below them. 



The means obtained were as follows : — 



