100 On Plaister of Parish 



\_See not^ f^J-'\ And when so connected, a small quan- 

 tity of such manures or substances will give it activity. 

 The auxiliaries necessary to draw forth the powers of 

 the plaister, are within the reach of every farmer, of 

 common industry and moderate capacity. The first ap- 

 plication, without other assistance than that it finds in the 

 earth, from the decayed and decaying roots, and other 

 vegetable substances, will throw him up forage, and 

 enable him to increase his stock. The more stock, the 

 more animal manure for summer or winter crops, prepa- 

 ratory to the repetition of plaister, with clover. The green 

 manures only cost the seed which produces them. With 

 these auxiliaries, I am satisfied, by actual and long 

 experience, that the gjpsum may be repeated as safely, 

 and with more benefit and less expence, than can any 

 other manure, on soils suitable for its application — a cir- 

 cumstance which ought always to be kept in view. 



in a state of putrefaction. It also is before shewn, that the 

 vitriolic acid in plaister, disengages from the substances con- 

 taining, them, «// the g-ases,^ Ths theory, thereiore explains 

 and coroborates the fact — that the plaister operates with 

 most power, Vv'hen it finds animal or vegetable putreiactions 

 (dung., buckzvheat ploughed in, &c. &c.) in the earth in 

 which it is strewed. It,- of course, shews why it will not ope- 

 rate at all, when the animal or vegetable substances, or other 

 bodies containing the gases, are not in places where it is 

 strewed. 



*And no doubt it finds in the earth chemical ag;ents (whatever they may be) which by superior 

 affinities decompose the ^^sura, and set the sulphuric acid free, to perform its operations. 



K. P. 



Srptember, 1810. 



