C73 ) 
VI. An Account of B O O K S. 
r. The Mathematical Works of Dr. John 
Wallis, Savilian Profejfor of Geometry in the 
Zinwerfity of Oxford , and Fellorp of the 
Royal Society^ inTwo large Volumes in FoVio. 
e Theatro Oxon, 
]N the former of them are contained, Hislnaugu^ 
ral Oration, when he entred upon that Employ- 
ment, Oiioh.ii. 16^^, 2. His flfathejis Vniverfal/s y 
or 0pm Arithmeticum ; containing not only Numeral 
Arithmetick, but the Spweus and Algebrick, or the CaU 
cuius Geometriciu ( Philologically and Mathematically 
handled ) with many Difcourfes or fmaller Trafts in- 
termixed, thereunto relating. 3. A Treatife concern- 
ing Proportions ^ diftinguifhing xht Proportio Dupla^ 
Tripla, ^c. from the Duplicata^ Triplicata, ®c. ( occa« 
fioned by a Treatife of Meihomius, entituled, De Pro- 
portionihm Dialogus;) With a Preface concerning Culi^ 
cat jiE^uations. 4. A Treatife of Conick SeSiom^ in a 
New and Eafie Method ; confidered as plain Figures t 
exempted out of the Gone. Whereby the Doftrine of 
Conicks is made much more Intelligible than formerly, 
when it was efteemsd fo perplex and intricate, as to de- 
ter many from medling with it. 5. His Arithmetick 
of Infinites^ being a New Method of Inveftigation or 
Enquiry into the Qaadrature of the Circle and other 
Curve-lined Figures and nnany other Myfteries in Ma- 
ihematicks, which were before held as deplorate. 6. Aa 
Obfervation of a Solar EcUpfe at Oxford^ Aug.%. 16 
StiL Fet. 7. A Treatife of the Cycloide^ with the Bo- 
dies and Surfaces thence derived; occafioned by a Pub- 
