(7x86) 
tity Is ever divifible, and that a /iries of equal quantities^ or-- 
of fuch as do increafe equally, or in a dupUcat or trtplnat 
ration, is an Infinit quantity, and holds no proportion to a 
Einiti and that there is no quantity jnfinitly {mall i tht^n he 
would have him grant , that the Dodirine of Dr. Wallis 'm 
his Jruhm$tica bifinitorum^ and in his Book of Motion lately 
publi{h*d^is vain and falfe as founded on themjbut if other 
wife, he will ycild the vidory. 
The Book it felf treateth firft of 21 Prspofitions^ faid by 
the Author to have been attempted hitherto in vain : adr 
ding a Cenfure concerning Dr^lVallis's two firft parrs d/^ 
Motion and Mechanick^s, which hath forae ftridures accufin^ 
thofe Treatifes of Obfcurity and vicious Definitions^ 
whichhow juftly'cis done, 1 leave to the Readers Judg* 
iiientj orto the Anfwer that may be expected frora the 
Ferfon concerned. 
V. The Prodromus of a Dijiertation concerning a SOLID 
CONTAINED IN J SOLID, Nicolaiis Steno. 
Englijhit out of Latin. London i6y i* Mofes Pitt in 
Litle Britain, in 8% 
THe Author of this Curious and Learned Prodromus 
apprehending, that he might be diverted for a great 
while from finifliing his intended main DilTertation touch- 
ing the Frame and Changes of the Earth 5 and the Manner of 
the ProduUions made therein $ thought fit to deliver in this 
Tradtboth a Scheme and a Breviateof the fame;^ foraf- 
xnuch as he doth not only delineate the Method , he hath 
therein obferved 3 but a!fo Turns up the moft confiderabic' 
particulars of his whole Defign. ' 
He faith then , that he hath divided that Diflercation of 
his into Fmr parts. The Firfi. hy way of Introdudion 3 is 
to fliew, that the Queftion about Marine fu}?jiances^ found 
at a great diftance from the Sea , is ancient , pleafant and 
ufeful, and that , though the Solution thereof have been 
hitherto v.ery uncertain, yet he hopethhe fliali be able to 
, bring it to a certainty. The Second^ refolveth this Gene* 
r^l Probl^em X w^henee he conceivetl\ that the Explicatioo 
