( 201$ J 
^umh.66 
PHILOSOPHICAL 
TRANSACTIONS. 
Becemb. 12. i6yo^ 
The CONTENTS. , 
ExtraSs of two Letters. concerning a late Dlfcovery of a Rock^ of 
Natural Salt in England. An Accompt touching away of re* 
ftoring the Salubrity of the Country ahoHtKomQ^ applicable t& 
other places. An Experiment of the Progre^ of Artificial 
Conglaciation^ and the remarkable Accidents therein obfervd 
by the Florentin Phiiojophers^ An ExtraB of a Letter of M, 
Hevelius, concerning his Obfervations of a late Ecliple of the 
MooOj a Conjunifion of the Moon and Veous • as alfo fome 
further remarks of ivpo^QW Stars^ d^c^ The PrediUions of 
M, Flamftead concerning fome notable Obfcurations of divers 
Fixed Stars in the Tear i6y I, An Accompt of three Bool^r^ 
I. ORIGO FORMAKVM & ^AUTAIVM, Auth, Ro- 
berto Boyle .• nopp Printed in Latin. ILMETALLOGRA- - 
PHIA, or an Hiftorycf Metals John Web fter> III. LET^- 
TERA di Fraocifco Redi Sopra alcune Oppofuioni fatte die 
fueOffirvationt intorno alle VIPERE, 
ExtraUs of two Letters^ written by the Ingenious Mr. Adam 
. MmmdAlt to the Publijher from^oth^xion i^Cheftiirej 
Novemb, 12^ and Nov. 26* J 670. concerning the Dif' 
covery of a Rock of Natural Salt -in that Country^ 
AGeotlemao of good account and reputation affures 
me^ that in our County there is lately found out a 
great rarity, viz. a Rock^oi Natural Salt, from which iffues 
a vigorous ftiarp Brine^ beyond any of the Springs made ufe 
H h -of 
