(6*7) 
when the Liquor falls between the heads, which are fuppofed 
ere& to the Horizon. 
z. The Menfuration or Plaining of the Surfaces of divers 
Solids cind Spiral Spaces, unknown to Antiquty, and not treat- 
ed of by any modern Authors, till of very late years 5 from 
whom the Author differs in his Method : Particularly he finds 
a Circle equal to the Surface of 
A 6 Parabolical ^ Conoid, refembling a Cup or Bowl \<uiz; . 
A n£ HjperMical > when the Revolution is about their Axes, 
Prop. 4*. & 4p, 
The Parabolical Hour-Glafs or Solid, when the Revolution 
is about a Touch-line paffing through the Vertex^ Prop.fr. 
a 5 Long ? - , . , AndPr.67. He finds the furface 
^BroadS ^P na ™ ia > ™M7. 4*. of »y regent of 
Generally Prop. 36. The Surface of every Round Solid is equal 
to a Redlangle, whofe Bafe is the Circumference of the Figure* 
by the Rotation whereof the Solid is begot, and the Height 
equal to the Circumference , which the Ceatej; of Gravity 
of the Perimeter of the Figure defcribeth # 
3. A Method for ftreightning of Curved lines in the firft 6 
Propofitions y and in particular lie finds a Right line equal to a 
Parabolical r Curve, Prop. 51 
4. Divers Of tick Propofitions towards the end of the Book, 
concerning the Imperfeftion of the Eye, andtheConfufionof 
the Sights the apparent Magnitude of the Sun, low and h?gh| 
the Tails of Comets 5 what Proportion the Earths illuminati- 
on by the Sun at the Full of the Moon bears to the illumi- 
nation of the Earth by the Moon y and the like compariforr 
between the Sun and Sirms y That vifion by aid of a Telefcope 
or Microfcope, is not deceitful r And an Qbfervation of the/ 
likenefs between the Earth and theMoon # 
This fame Author in his Letter to Mr. fiC fuggefts-, that 
Caffwi hath obferved the Motion of tfupiter about his Axis in 
10 hours 5 of Mars in 23 hours 5 that Venus hath the like 
Rotations but the ptecife period not yet known 5 that Cajfini 
