594 



/ 



ADDITIONAL NOTES. 



of calcareous lime with foil, he found that thirty or forty grains of 

 linae did not retard the growth of feeds more than three or foiir of 

 calcined magnefia; from hence what can we conclude? but that, as 

 they both injure vegetation in large quantities, they may both affift 

 vegetation in fmall ones ? and that this is more probable, as the far- 

 mers believe, that they find both of them ufeful, though in different 

 quantities ; and as the magnefia would form Epfom fait, if it meets 

 with vitriolic acid, which Dr. Home found from his experiments to 

 be friendly to vegetation, when ufed in very fmall quantities. More 

 accurate obfervations and more numerous experiments on this fub- 

 jed are required, which this important difcovery of Mr.Tennant's 

 will I hope foon occafion. 



D 



h 



To he Infer ted at p. 286, /. 16, at the end of No. 2 of Se5l. XII 



Another method has been attempted by fome for the purpofe of 



\ 



meliorating clayey lands, which 



fit 



than they had been accuftomed to be ploucrhed, on 



be turned up deepe 



acidity or tenacity being very injurioi 

 faggar clays over many coal countrle; 

 clays, which may contain a vitriol of 

 genated calx of it. 



account of th 

 veojetation ; as the wh 



r 



fom 



very 



d 



not an 



oxy 



The method I allude to, confids in fird turning over a rido-e of 



common plough 



and then with a plough, made 



purpofe, to penetrate fome inches deeper into the clay io inj 



vegetatioa ; this 



plough 



IS 



to be fo 



trived, as to 



fe 



u 



p th 



yey foil about the breadth of the furrow recently made, and th 



four inches deep 



but not to turn it over, fo that it may 



flill lie under the fertile foil, which is to be turned 



common 



r 



D 



h 



mak 



i) 



the 



adj 



fui 



So th 



; this 

 ough 



