C ^043 J 
whether thofe of his Society, in cafe he I^ath made a good 
progreli tbereio, will takt-cars to fee ie publiftitsWe koow nor § 
but yet hope^ H^ hath gone a good Way thereio/aod^ if fo, 
that his CoOTpaoions will not fupprcfs his labors, fo^ the btQC" 
fit of youog Students in this kind of knowfedge. 
CoDceroingthe whole Dejfgn] the Author (^s appears by the 
Pf^c^tQ this part of itj hadfb coarrived iras to makeitup 
of ^/x parrs. 
Thtfirfi is oi Local mothn^zlxtzdy publifliedby him,though 
he thought not fit to prefix his Name to that parr^ io the year 
\6yo. in trench^ and Engliih't the fame year ^ deferibed io: 
N;/^^. 65. p. 20 10. 
They?ir^»6^isthis very Dilcourle^ entitukd as abx^ve^whicli^ 
treats of fuchMotioDS, as are performed with Violence, by 
furtnounting the Refiftaoee that is made from elfewhere.Herej 
bcfidcs the Dcrabnftration given of all thofe Moving Eogios, 
whofc force may be reduced to that of the BaUmce^, (omt re- 
flexion is made on the Impoffibiliry of tht Perpetual Motion. Be* 
fides, the Author treats of Bodies fufpeoded^ faftoed at one 
orbothEods ^ of the manner how they are broken 5 of the 
figure they take in becoming curve ^ and particularly of the 
Cafes, where Cords extended will be Parabolical, Hyperbo- 
lical, Elliptical, or Circular. More-^over, he examins the 
forceof Towers and Pyramids, and (hews in what part they 
are weakeft5 he determinsthe figures they ought to have to 
render them perfcft and able every where to relift equally to 
the violence of Winds 5 delivers General Rules of ^he Refi* 
ftancc of bodies, and teaches the way of applying thofe ge- 
neral rules to particular cafes, relating to Architefture and o- 
ther effefts of Nature and Art : And taking an Example of the 
SBotion of a Ship^ht: oblcrveth the ufe that may be made therc^ 
io of the Rulesof Mechanicks. 
By the by,having made mention in th^Preface of the uniforcn 
inotionin a Cydoid^ he gives us his way of demonftrating this 
Uniformity, to fee, whether, when M./Jvj;e»/ (ball have pub- 
lift't bisdcmonftration, he be fa fortunate as to concur with 
iiiniinit. 
As far the other four part% (which . hii .Dmth^ 'lis-feaf eA^i 
will 
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