/ 



^^T.y, 



'•j> 



1 * 



I 



'%n\t^ 



1 



'U* 



^0 leave 



■'^ bo\v«„ 



■offr 



to 



ever 



occur 





5 as 



- ater wl^ 

 ^ir rnore 

 old clav 



udth 

 ol. I. 



per 



y con. 



us 



pan 



p. 9. 



^es, detrudes 

 ■ f:£lsofco!i. 

 and water, or 

 :v air; theal- 

 )f copper, are 



•etieat to tiie 

 ito numerous 



,tly obferve^; 



:d more 

 dried, audits 



thofe circuffl- 



'\C 



i 



ulture. 

 fter tbey 



are 



into 



their in- 



f vitrifies- 



eso 



u and potteo;; 



. the unio" 



ol 



oxy 



des 







^s 



in 



a ^inc 



) 



af5 



, h^ 





Sect.X. 7 



MANURES 



3 



d with oxvgen by the pafTing currents of the ataiofi 



d 



have been fuppoled to 



have originated from the decompofition of 



getables and animal bodies, as 

 additional note 

 matters, mang 



fome of them ; and. if we polTefled a teft for 



d in Botanic Garden, Vol. I. 



t 



8. Iron has been deteded in all vegetable and animal 



lefe in 

 difcovering fuch minute particles of zinc, as the magnet difcovers of 

 iron, it is probable, that zinc alfo would be deteded in the vegetables,, 



which grow over its beds.. 



As fome philofophers have lately contended for the great utility of 

 ©xyoen in vegetation, as Humboldt and Von Uflar ; who affirm frona 

 their experiments, that hyper-oxygenated muriatic acid ufed in fmall 

 quantities promotes both the growth and irritability of pi 



th 



fon to fufpe(5t, that the calciform 



of iron, mansrancfi 



t> 



and 



zinc, as 



well as minium, and 



r calces 



ydes of metals mad 



by fire, and even burnt clays, when ftrewed on the ground, may 



in a 



ibute to vegetation by their parting with their abundant oxy 

 fluid, not in a gaffeous form ; which uniting with carbon. 



or 



h 



or light 



«, 



furth 



phofphorus, or nitrogen, without emitting perceptible 

 mio-ht fupply nutritious fluids to the roots of vegetable 

 periments are wanted on this fubjpd:. But I am well informed, that a 

 red ocher of iron, called raddle, has been ufed on fome lands with ad- 

 vantage in the north of StafFordfhire ; and (hould recommend a trial 

 of man^anefe in thofe countries, where it abounds, as nearKingfbury, 

 and near Atherflone in Warwickfhire ; and a trial of lapis calaminaris. 



where it abound 



Matlock in Derby (h 



d even of th 



calciform ore of lead, which is found in Anglefey, and on the top of. 



fome other lead mines. 



M. Humbold afferts, that he mixed many feeds into a kind of pafle^ 

 with the black oxyde of manganefe, and poured over it the muriatic 

 acid diluted with water, in the proportion of about fix of water to^ 



one of acid ; and that much oxygen was thus difengaged, and occafipn- 



ed. 



