[ 345 3 



a very ftlff clay, for inftance ; and this not only be- 

 caufe a light crop would be the confequence, but 

 alfo that wet heavy foils induce a diminution of the 

 farinaceous matter; thus the roots of the very befl: 

 fort are apt to degenerate in unkindly foils — again, 

 there are fuch as will not be reclaimed by the mod 

 favourable. 



The mod valuable fort I conceive to be that which 

 contains the greateft proportion of farinaceous mat- 

 ter. I have made a great number of experiments 

 in this refpeft, but never extracted more than be- 

 tween one-third and one-fourth of the weight of the 

 root; in fome inftances not more than one-feventh 

 has been obtained. So that it feems elTential not 

 only to hit upon a right fort in the beginning, but 

 to preferve it by a proper attention to the nature of 

 the foil. 



I have made excellent bread with a mixture of 

 one-third boiled potatoes and two-thirds wheat flour. 

 But if ever potatoes fhould be introduced as an ar- 

 ticle in bread, on a general fcale, I doubt not the 

 proper mode would be, in the firfl: inllance, to extraft 

 the flour or farinaceous matter by means of fome 

 fuitable apparatus, that might eafily be invented. — 

 Thus a determinate rule would be eftabliflied of ap- 

 portioning the due quantity of potatoe flour, and of 

 wheat flour, to be employed in the compofition. Bo- 

 lides it would be the only effectual method of fecu- 



ring, 



