PHILOSOPHICAL 
TRANSACTIONS. 
Monday, A frit i$ 1668 
The Contents. 
The Squaring of the Hyperbola by an infinite feries of Rational 
Numbers, together with its Demonfiration, by the Right Bonott* 
table the Lord Vif count Brouricker, An Extract of a Letter fent 
from Danzick, touching fome Chymical^ Medicinal and Anato^ 
mical particulars. T wo Letters, written by Dr. John Waliis 
to the Publifher ^ 0/?<r x concerning the Variety of the Annual 
High-Tides in refpeB to fever al -places : the other, concerning fome 
JMifiakesofa Book enftmled SPECIMINA MATH EM ATI- 
CA Francifci Dulaurens , efpecially touching a certain Pro- 
bleme, affirm' d to have been proposed by Dr. Waliis ft; the Ma- 
thematicians of all Europe, for a folution. An Account of fome 
Obfervations concerning the true Time of the Tydes , by Mr 9 
Hen. Philips. An Account of three Bo&ks : I. W.SENGWER- 
bfttS Pi^lD.de Tarantula. II. REGNERI de GRAEF M.D> 
Epiftola de nonnullis circa Partes Genitales Inventis Novis. 
J/J. $0HANNIS van BORNE M.D. Obfervatiorium fuarum 
circa Partes Genitales in utroque fexu 5 PRODROMUS. 
The Squaring of 'the Hyperbola, ly an infinite feries of Rational Numbers r 
together with its Demembration, by that Eminent Mathematician >, the 
Right Honourable the Lord Vif count Brouricker. 
WHat the Acute Dr. John Waliis had intimated, fome 
years fince, in the Dedication of his Anfwer to 
M. Meibomim * de propertionibm , vid. That the 
World one day would learn from the Noble Lord Brounker, the 
Quadrature of the Hyperbole the Ingenious Reader may fee per- 
formed in the fubjoyned operation, which its Excellent Author 
wrs now pleafed to communicate, as followeth in his own 
words 5 
Z 1 z Mv 
