(70 
and Compofitions of Morion 5 which give Light to the 
clearing of many Difficulties formerly apprehended, as 
relatir4g thereunto. 6. A Difcourfe concerning Euclid's 
Fifth Fofiulate, and his Fifth Definition of his Sixth Book ; 
in Vindication of Euclid from the unjuft Exceptions of 
divers, occafioned by their mif-apprehenfioos of Euclid's 
Defign t&erein. 7. A Treatife of the Cono-Cuneus, or a 
Body reprefenting partly a Cone, and partly a Wedge, 
with the Sections thereof made by a Plane ; confidered 
in like manner as what are called the Conick SeSiions. 
8. A Geometrical Difquifition oi Gravity and Gravitation ; 
wherein the Doftrine of the Counter-poife of the Air is 
defended againft that of the ^ndtatsFuga Facui. 9. A 
New Hypothefis concerning Tides , or the Seas Ebhing 
and Flowing ; derived from the Common-Center of Gra^ 
vity of the Earth and Moon, confidered as ConjunO: Bo- 
dies. 10. Commercium Eptflolicum ; being a Colieftion 
of Letters wiiich palTed between Meffieurs Fermat and 
Frenicle on the one Part, and the Lord Vifcount Broun- 
ker and Dr. Wallis on the other Part, by the Intervention 
of Sir Kenelm Dighy ; concerning divers Queftions Ma- 
thematical II. A Treatife of Trigonometry , Plain 
and Spherical, of Mr. John CafwelL 
%. Tratiatus 
