C 20 | 
the quantity of produce; in moft of the five yeare 
experiments, the produce from pieces of potatoes 
was inferior both to large and to {mall whole pota- 
toes; yet, in general, the pieces exceeded the {mall 
potatoes in weight of feed. 
Though the large and {mall potatoes, mentioned 
in the experiments, are relatively fo, compared with 
one another, yet fome of thofe, called large ones, 
might, perhaps, with more propriety, be denominated 
middle-fized potatoes. An acre of very large pota- 
toes would require a quantity of feed fo great as to 
deter any perfon from planting them; - nor is it 
likely, that the produétivenefs of potatoes will con- 
tinue to increafe with their fize. There is certainly 
a maximum and minimum, ane plus ultra in the quan- 
tity of potatoe feed, as well as in every thing elfe. 
The middle-fize of the human fpecies, as well as of 
the different fpecies of other animals, are the beft 
calculated to undergo fatigue and labour; they are 
therefore more perfect in their kind, and confe- 
quently fitter to anfwer all the purpofes of their 
creation, May we not argue from analogy, that 
potatoes of a moderate fize are the moft perfec in 
their kind, and confequently the beft fitted to fend 
forth thofe vigorous fhoots, which infure a well- 
fized and healthy progeny? 
The greater the number of {trong fibres and roots, 
the more do they fearch for food, and the more 
earth do they difplace in the courfe of their grow: 
3 ing 
