(840 
An Account of two Books. 
|. A C a NT ftfU ATI ON of N E W : E XP$R 'I- 
M E NTS Phy ftce* Mechanical r touching the SPRING 
A nd WEIGHT of the AIR 9 and their EffeSs^ the 
i # PAR T,&c t hy the Honour die ROBERT BOYLE, 
Fellow of the Royal Society, Oxford 166% in 4°, 
THellluftrious Author of this Book hath therein afrefti fur- 
niflht the Philofophical World > withafetof very mate- 
rial and pregnant Experiments(to the number of 5©.) which are 
partly improvements of the former of this Nature, partly, (and 
thofe far more numerous) fuperadded new ones : concerning 
which, He declareth, that in great part he aimed thereby to 
(hew, that thefe very Phtnomena, which the School- Philofo- 
phers urge, as clear proofs of Nature's Abhorrency of a Vacu- 
um, may be not only explicated, but a&ually exhibited, fome by 
the Gravity, and fome alfo by the bare fpring of the Air-, which 
latter he nowmention$ as adiftinft thing from the other, notas 
if it were actually feparated in thefe Tryals ( fince the Weight 
of the upper parts of the Air does, as 'twere, bend the Sf rings 
of the lower) but becaufe that having in the formerly publifht 
experiments, and even in fome of thefe, manifefted the efficacy of 
the Air's Gravitation on Bodies, he thought fit to make it his 
task in many of thefe , to fhew, that moft of the fame things, 
that are done by the Preffure of all the fuper-incumbent Atmo- 
fphcrea&ing as a Weight , may be likewife performed by the Pref- 
fureof afmali portion of Air, included indeed, but ( without a~ 
ny new Compreflion) a&ing as a Spring. 
The Experiments themfelves, contain'd in this Book, are ftill 
of that fort, which need but a fhort abfence of the Air there 
being another fort, which require, that the Air fhould be kept 
out for aconfiderable time from the Bodies, whereon the trial is 
made-, concerning which latter, the Author ftill gives the Rea- 
der hopes of prefenting him in due time with fuch as may not be 
unacceptable to him. The Experiments of this Part are 
i. About the raifingof Mercury to a great height in an opent 
Tube, by the Spring of a little included Air$ wherein 'tis dif- 
cours'd, how this Experiment may be made ufe of againft thofe, 
who in the explication of the Torricell. Experiment recurr to 
a Funiculus, or a Fuga Vacui. 
Ccccc a/ShcwetfC 
