g6 , . '^Exftriments and Obfervations 



ift That Gypjum in fmall quantities iias no vifible effe£l 

 on wheat or rye. 



2d That it is imiformly beneficial to Indian corh, unlefs 

 it be in very rich or very wet foils. 

 ^ '^'qd TH'kT'it is beneficial to flax on dry poor fandy land, 



!lth That it is peculiarly a&apfed tW'the gro>vdi of clover 

 in all dry foils, or even in wet foils in a dry feafon. 



5th, That limeftone pulverjzpd has fimilar effe61s with 

 Gypjmiv whether--ttJ^(beiii€c a(^]^ei^:tp.;wpt,fe-y^^^ 

 :d€iet£riine. -. bfidi-nlab aic'isd lio'l -jocq r>/fj ni ,: vf To -■" 



' 6tli/'' AFo rtl^'R ' fafl^feenis tb"^ b^e Veiy well eftkbliflied, thb' 

 I can fay nothri^g of it from iriy own experience, to wit, that 

 its effefts as^a m'aHu''fe'a:rfe hardly pei'ceivable in the vicinity of 

 the fea. 



I KNov/ not whether tjipfe ia'Bs will be deemed fufficieni^ tp 

 ferve as the bafts o£-a.;theory On. .the Jiature .of this manure; 

 i)ut as this fubjejSl appears invQlv^d i/jif difficulties which np 

 ,one has yet attempted to re^ipye, I conceive that the man who 

 in doubtful cafes hazards; p^eii ; <i defeai ve theory,, , help^. j to 

 enlighten a fubje^i, by Ipr-ovok^i^g others to combat hisopiniari. 

 The hrft ftep in determining how Calcanous or Gypfious earths 

 operate as manures, is to acquire a knowledge of their conlti- 

 tuent parts; and for that piirpofe I coiild have wiflied Yor^a 



