•[ iii ■] 
^equally approved in Oermany^ nor, indeed^ 
:has it been unknown to the learned in England ; 
for the ingenious and celebrated Dr. Lewis 
has mentioned it with pi-aiic in the fecond part 
of his Philofophical 'Comit^erce of Arts lately 
publiflhedo 
As a foreigner I ihpuld make an excufe 
for the tonfl^tion, it not being fo ejegant as it 
ought to be ; hovv^ever, I flatter niyfetf I fhall 
not be too feverely cenfured on that account, 
iince it is a known truth, that originals always 
iofe fomething of their beauty by being tran- 
.flated : I therefore think it better to prefer the 
true .meaning of authors to the elegancy of 
ftik, particularly in fcientifical works 3 and I 
am in this refped; more able to give the Public 
Jatisfadion, as I have had the happiaefs to be 
.a difciple of the author himfelf. 
That the mineralogical terms might be more 
generally underftcod, 1 have added the Swedifh 
^and German names of the mineral bodies to 
'their Englifli and Latin names 3 except when 
'to avoid tautology I have fometimes left out the 
German as nowife different from the Swedish 
.•names. New difcoveries being daily made in 
this fcience, I have alfo added feme notes of 
•my own, concerning fuch things of v/hich I 
am perfeftly convinced, leaving feveral others 
rto be further examined and tried. 
I was in hopes to have feen a fecond edi- 
tion of this excellent work improved and aog- 
imented by the author himfelf j he having, 
.a .a ever 
