59^ 



ADDITIONAL NOTES. 



fait 



muriate of fod 



I, and vitriolated magnefia, commonly called 

 Epfom fait, which in the fea-waters furrounding this ifland were 

 found at a medium to exifl in the proportion of one thirtieth part of 

 common fait, and one eightieth part of vitriolated magnefia compared 



to th 



quantity of water. And fecondly as thefe falts are believed 



hy many philofoph 



have been formed by vegetable and animal 



matters, which principally grew upon the furface of the dry land, 

 after it was raifed out of the primeval ocean ; and that in 'confe- 

 quence the faltnefs of the fea was pofterior to the formation of the 



primeval rocks of limeftone ; and from hence we 



thofe limeftone ft 



which h 



derftand, why 



not been difTolved or wafhed 



became fait, are not mixed with mas 



\ 



in fea-water iince the fea 

 iiefia. 



The chalk mufl have been difTolved and precipitated from water, 

 as it exadly refembles the internal part of fome calcareous f^akaites, 

 which I have in my pofleffion ; yet there is no appearance of its 

 component particles having been rubbed together into fmall globules, 

 and may not therefore have been removed from the fituation, where 



9 



It was produced 



by 



elevation above the furface of th 



ocean. 



But that alluvial limeflone, which confifts of fmall globules adher 



D 



ether, called Ketton limeftone 



\ 



be 



fhi 



nd of which there appears 



bed ten miles broad from Beckingham to Sleaford in Lincoln 



and twenty miles long from Sleaford to Lincoln 



may probably confift of magnefian limeftone 

 that country to do no fer 



I fufpea 



which is alfo faid 



for th 



lime 



J . ^^ ^^ »v.^vLaLiuu, lui LUIS aiiuviai lime 



ftone by having evidently been long rolled together beneath the fea 

 by which the fmall cryftalllfed parts of it have had their andes rub 



bed off. is 



mofl likely to have thus been mixed with th 



of the fea-water, which 

 weight of vitriolated magnefia 



faid to contain one eightieth 



e magnefia 



\ 



bove mentioned 



par 



of 



At the lime-works at Ticknal near Derby there appears a ftratum 



/ 



o^ 



o 







1( 



\ * 



