(^4) 
under ground above 6 hours 5 all of them in time ( fome 
later, fome fooner) become paralytick^^ and dye he£licl{. 
We fa¥/ there a man ^ who had not been in the Mines for 
above half a year before ^ fo full of Mercury ^ that putting a 
piece of Brafs in his mouth 5 or rubbing it in his fingers ^ it 
immediately became white like Silver : I mean , he did the 
fameeffeft, as if he had rubb'd Merc7irj upon it^ andfopa- 
raly ticks that he could not with both his hands carry a GIa% 
half full of Wine^to hi^ giouth without fpilling it, though he 
loved it too well to throw it away, 
I have been fioce informed^that here in Femce^thok that work 
on the back'fide of Looking-glafles , are alfo very fubjeft 
to the Faifij', I did not obferve, that they had black Teeth^ it 
pay be therefore^ that we accufe Mercury injuftly for fpoiling 
the Tceth^ v/hen given in Te^ere^/difeafes, I confeft^I did not 
think of it upon the place 5 but^ black Teeth being fo very rare 
in this Country 5 I think I could not but have markt it, had all 
theirs been fo. 
They ufe exceeding great quantity of Wood 5 in making 
gnd repairing the Engins , and in the Furnaces ( v/hcreof 
there are 16, each of them carrying 24. Retorts^) but prin- 
cipally in the Mines 5 which need continual reparation ^ the 
Fir-trees lafting but a fmall time under ground. They con- 
vey their Wood thus I About four miles from the Minesj 
on the fides of two mountains^ they cut down the Trees,, and 
dravv^ them into the interjacent Valley ^ higher in the fame 
Valley ^ fo that the Trees ^ according to the defcent of the 
water lye betwixt it and Idria i with vaft charges and 
quantities of Wood they make a Lock or Dam, that fuffers 
not any water to pafs ^ they exped afterwards , till there be 
water enough to float thefe Trees to idriay for^ if there be 
not a fpring, (as generally there is, J Raiog or the melting of 
the Snow, in a (hoxt time, afford fo much water, as h ready to 
run over the Dam^ and which (the Flood-gates being open d J 
carries all the Trees inipetuoufly to Idria ^ where the 
Bridge is built very fl:rong,and at very oblique Angles to the 
iiv^^m J on purpofe to ftop them ^ and throw them on Chore 
neer the Mms. Thofe 
