450 Experiments upon the Potatoe, 



has the power of growing undisturbed by its neighbours, and when 

 in consequence the real productiveness of each could be ascertained 

 with the greatest accuracy. In order to make this experiment the 

 more satisfactory, it was determined not to confine it to the five 

 sorts above-mentioned, but to include a considerable number of 

 other varieties, from the average of which it was thought that a 

 conclusion might be safely drawn. I must confess I anticipated 

 that in this case at least the tubers, having full space to develope 

 themselves, would certainly surpass the sets very materially in 

 proportionate productiveness; but the result proved to be alto- 

 gether the other way ; as will be seen. 



We selected a piece of ground of quality as nearly uniform as pos- 

 sible ; it was divided into four feet squares ; and in the centre of 

 each square was planted either a tuber, or a single eye, or a set 

 containing three eyes, or the whole surface of a tuber pared off so 

 as to leave the eyes safe but to remove the centre ; a practice which 

 is not. uncommon in Scotland. The following table contains the 

 details of the experiment. 



li 



y 



3. Red Nosed Kidney 



f<7.2'J 



30.98 

 36.20 



M v..' -2 

 June 2 3 

 May31 3 



May31 i 

 May 3 May28 2 6 



Parfngs 



