52 On Plaister of Paris. 
had so much manure; the former being much more 
subject to be injured by drought than the latter, from 
which I am of opinion, that to preserve the fertility of 
land it should lie under grass as long as it conveniently 
could, and to vary the kinds of manure and productions. 
I am, sincerely thine, 
Joun SELLERS. 
Ricuarp Perers, Esq. 
