Numb. %i8. 
PHILOSOPHICAL 
TRANSACTIONS. 
iv/* the Months 0/ November and December, 16 9 f;. 
The CONTENTS. 
I. W^Ropofitio Generalis Ar ear urn dimenfionem exhilens in 
univerfo illo Curvarum Genere^q^uce revoiutione ceqtia' 
lilt CircuH fuper Bafin quamvis^ Del retliltneam vel CircH^ 
larem defcnhi pojfint ; nempe omnium Cycldidum vel Epi" 
cycloidum, quovis modo gemtarum. Cum DemonlJ rat zone 
Quadrature portionis Epicycloidis a DominoQ^is^tW inven- 
tm, (Numi.iiy, p.i i^. promifsa) per E. Hal'ey, \\: An 
Extrail of the Journals of two fever al Voy ages of the 
Englifh Merchants of th£ FaElory Aleppo, to Tadmor, 
anciently caj^d Palinyra. HI. Some Account of the an* 
cjent State of the City of Palmyra, with feme fhort Re-- 
marks on the Infcriptions found there : With an Ohferva" 
tion of the Latitude <?/ Aleppo, and the afcertaining of 
the Geographical Site of the Ancient Ara-fla, and fever a! 
Cities in Syria. By E. Halley. 
I. Fropofitio Generals Are arum dimenfionem exhihens in univerfo 
iUo CuTvarum Genere quoi revolmiom ^equahili CtreuU fuper Eafin 
quamvis vel re5filineam.vel Circularem. dejcrihi pojfint y &'c, 
•R^'jQtum eft Cycloidem primarianij ficut etiam Prolatam a.c 
lN Contradam (quas Trochoides vocancj a Ceiebsrrinio 
Waliifio aliifque uberrimetraiftatas fuiffe 5 earumquepropdeca* 
tes dudum innotuiffe : ut jam vix Uceac quicqliam novi de iis 
