C 78 ) 
An Acconipt of fomc Books. 
l.Obfervatiom tmhing the TORRICELLUN' EXPERI- 
MENT^ and the varms Solutions of the fame^ efpeciallj 
touching Weight and Elafticity oj the JIR. London, 
1674. in 8». 
THe Learned and Inquifitive Author of thefe Obfervati- 
ons, having thought fit not to prefix his Name to this 
Eook,that fo he might be the fitcerfashimfelf intimates)tobear 
the correftion of his Errors, if any fuch fliould occur to his - 
nor ice ; we have no reafon to blame him for that omifllon, but 
rather commend his modefty and diffidence,and wiihall enter- 
tain the hopes of feeing fomething publifli't hereafter from the 
famous Patrons of the Hypothefis by him impugned, that may 
either contribute to the further elucidation andeftabliflhment 
of their Doflrine, if it be folid, or ferve to reftifie their 
miftakes therein, if it be ill-grounded. 
Our Author then,taking this difficult fubjeft in hand, pro- 
feffeth in the beginning, that, to avoid the imputation of a Pla- 
giary , he hath borrowed in this Controverfie fome things 
from others, efpecially from Francifius Linus and Honoratm 
Fabric though he alfo delivers fomewhat that*s new, and makes 
the method and manner of Explication of it as much his own as 
he can ; the which he performs in this order : 
I. He explains foms Terms which he hath occafion to ufe in 
this Difcourfe. 
2 He fets down fomtStatical Obrervations,neceflary to this 
Inquiry; viz concerning the Gravitation of water upon wa- 
ter ; of Air upon Air or any fubjeSed Bodies in it ; of hea- 
vier Fluids upon thofe that are lighter ; and of lighter Fluids 
upon thofe that are fpccifically heavier.Concerning which par- 
ticulars, he endeavours to prove, j&y? ; That the upper parts 
of water do not aftually gravitate or prefs upon the lower 
parts of it; where yet he acknowledges, they do gravitate ad 
pondus and phyfically upon the lower, fo as to make the whole 
heavier, though they do not gravitate ad motum or fenfibly : 
Which 
