( 5079 ) 
Difputat!ons(as they are here to be found)he had begun a few 
ffj iersoftbe ffth^ which was about the Diagram oi Hippar- 
chus Jrom which fome have pretended exactly to demonftrate 
theDiftanceof the Sun. After which follow two Difputati- 
ons more^ the one^ of the Celeftial bodies and their Motion; the 
other^ his Anfwer to the Cavils of Hortenfius againft Tycho. So 
much of the Firfl part of this Volume. 
The /^^"0;?^^ contains a good number of Extracts out of this 
Authors Letters to his intimate friend and induftrious compa«^ 
nion in the Study of Aftroaomyj William Crabtree. In which 
occurr many good Celeftial ObfervationSj interlaced with di- 
vers notable difcourfes concerning the Method of his ftudies. 
T1\\Q thirds is a Catalogue of Aftronomical Obfervations, as 
they were made by our Author^ without allowance for the Ex- 
centricity ofthc Eye 3 which he afterwards caftigated by a cor- 
rection fairly written with his own hand. 
The fourth^ is his New Theory of the Moon, together with 
thQ Lunar Numbers ot Mr. Flamjiead upon it. 
To thefe are annexed^yJr/? the Celeftial Obfervations of Wil:: 
Ham Crabtree, concerning Saturn^ Jupiter^ Mars and P'enus 5 and 
then^ MT.Flamfieeds Differtation o(the Inequality of Solar days^ * 
wherein are demonftrated the Pro/if^^/?W^j' ofthetime^ ne^^ 
ceflary to makean Equation,and proceeding from the Une- 
qual motion of the Earth from the Aphelion to ihQ Perihelion^^d 
the Inclination from the Equinoxes to the Solflices^ and vice 
verfa. 
III. Marcelli Malpighii Vbil. ^ Medici Bomnien^s Differtatio 
Epijiolica de Formatione Pulli in OvoiLondini apudjoh^M^x- 
tyn Soc. Reg. Tyfographum^ ad inpgne Campan^ in €£m£terio 
S. ?auh^ 1672. in^\ 
THis excellent Philofopher and Accurate Anatomift, a 
very Induftrious and ufeful Member of the iC^ «y^>i:/>j?;', ha- 
ving in a Mi??z//m^^ prefented that lUuftrious body with his 
Obfervations upon the Formation of a Chick in an Egg as well 
before as ^//^ Incubation • and that Company having efteem- 
ed them very worthy the Prefsjas well to do the Author righr^ 
as to give occafion to others to inquire further into a matter 
fo conducive for finding out the nature of Generation : We 
fliall here give fome accompt of this well-con fider'd difcourfc^ 
after we have intimated, thatanEnglifli Phyfitianj a worthy 
Member 
