[332 ] 
of the reft ; the firft is, that two equal peices of Iron were 
put atthefame tiirie into two equal Quandties Aqua- 
fortis^ the one in vamo, and the other in the open Air ; 
and being afterwards taken out at the fame time ; it was 
found that the / in the open Air/ had been 1 6 times 
more diffolved than the Iron in vacuo. 
The fecond Experiment is, that two equal Quantities 
of Rofes wcrQ put into two Inftruments for DiftUlations, 
like one another ; but the one was exha ufted of Air, and 
the other was full; the Diftitlation was abundantly grea- 
ter and quicker in the evacuated Inftrument, than in the 
other, although they were both heated by the fame warm 
Water; it was alio obfervable, that t!ie Rofe Water di- 
ftilled7>2 vacuo did congeal, which doth not happen in or- 
dinary Diftillations : So it is plain, that in fome Circum- 
ftances, the Vacmm helps Diftillations ; as well as in the 
firft Seftion it was feen, that in other Circumftances the 
compreffionof Air is more advantagious. In this whole 
Section are intermixed the reafonings of the Academy, a- 
bout the Matters in hand, and two Difcourles made in 
the Academy, hy Sigr. Amhrofio SarroHi in the beginning 
ofeach Tear : So the Reader may here be diverted as well 
asinftrufted in the Operations of Nature. It may be 
layd in fhort, that it is rare to fee a Book, that in fo frnall 
a Volume doth contain f) many things recommcndable, 
both for Ulcfuln-rfj and Novelty ; but no Wonder, fince it 
is owing to the Inftruclions and DireSions of the R. S. 
as the Author acknowledgeth in his EpfiUy which he in- 
Icribeth to My Lord of Carhery^ Prefident of that lUuftri- 
ous Company: Neverthelefs, the better to convince thofe 
that would quellion either the Truth, or the Ufefulneft 
of the Contents of his Book ; the Author engageth to let 
People fee them try'd once a Week, and he appoints a 
certain Time and Place for that Purpofe. 
London^ Printed by J. Streater^ and fold by S. Smithy at 
the Prim€\ Arms^ in St. ?auf% Church- Yard. 
