( I020 ) 
fweat were not farni(ht with fome efficacions diffolvent to open 
and pierce them. Where heobferves, that the beft liquored 
Boots, and fuch as are water-proof, will be quickly pierced 
by the fweatof Horfes^ adding, that though Riding Poft he 
had 5 to avoid that inconvenience , rubbed his Boots with a 
Vernice , which refiftcd even to Aquafortis , yet the fweat of 
theHorfes, he rode on, diffblved that fence after tbefecond 
day of h'S voyage. 
Nt xc , he holds it to be an error , to ufe Sfirit of ritrUl for 
VVhitening the Teeth, Experience (hewing, that from the 
mixture of an Alcalj and the Sfirit of Vitriol there rcfults a yel- 
low , and that there is an Alcaly continually tranfpiring out of 
the Gamms, as of all the other parts of the Body 5 whence 
it muft follow, thattheSpiricof Vitriol employed to rubb the 
Teeth, when mixt with that Sale , muft tinge them of the 
fame colcur. 
Then he affirms, that wood rott€»h2iXh no Alaly in it , and 
that it rots not but «pon the account of the exhaling of that Salt* 
Whence 'cis that the Venetians » to harden the Tim* 
ber defign'd for bnilding of Ships, fink It green in water , and 
there have it many years 5 which is the caufe, that the Alcaly 
havng beenhindred from exhaling the. Timber rots not, and 
becomes as hard in a manner as flone.^,. ji-,^v ,?WViK !r 
We cannot pretermit talcing notice 5 tKat this A^^ 
cccafioiiin this Book to explain the,, way ^ by^iicl^the fa- 
mous 7urnhei[fer ^ a German -Chymift,made that celebrated 
N il, haU Gjid ad half Iron ^^whi^his fliew'-dat f /^;rr;»;r^,in 
ilie Repoficory of tf>e Gi;ea^, ^uk^ of TufcAty.. ' lis faid, that 
that Chymift, having ifi ■thepirejtnjceotth^tpa 
in a certain Oyle the one halfc p£ a-^sl.aili, >i.jiich sppes^M to 6e 
all Iron, that part, which t^f^ucKecl/th^^ Qyfe:^ was inftantly 
fcund tobegood Gold, Several Pjerfqr^vhaym^^ 
Nail, and feeing the Gold, and Ifpn exi^(eedii^;w^]]conjoyneci^ 
were perfwaded, that that could' not be efFedledibatby-a-crdie 
change of one of thofetvyo ruetals into ^h^-etRen, believing it 
impoiTible, they could be/odet,'a.tqgether.. Bpt the Author of 
this Book maktth that a very e^lyttiing, if the Iron, be before 
p;e. ared after a ecu ua ip^irin.rp j wWf^ iU^ t^^ohetl)^ and; he 
