[ 4oi ] 
will have the fame Excentricity as the Diftance of the 
Globe from the Centre of the Cake. 
If the Cake of Rofin be of an Elliptic Form, and 
the Iron Globe be placed in the Centre of it, the light 
Body will aeferibe an Elliptical Orbit of the fame Ex- 
centricity as the Form of the Cake. 
If the Iron Globe be placed in or near one of the 
Focus’s of the Elliptic Cake, the light Body will move 
much fwlfter in the Apogee Part of the Orbit, than in 
the Perigee Part, contrary to what is obferved of the 
Planets. 
Experiment II. 
Take the fame or fuch another Iron Globe, and 
having fatten'd it on an Iron Pedeftal about one Inch 
high, fet it on a Table, then fet round it a Glafs Hoop 
or Portion of an hollow Glafs Cylinder of feven or 
eight Inches Diameter, and two or three Inches high : 
This Hoop muft be firft excited by warming and gently 
rubbing it, then hold the light Body fufpended as in 
the firft Experiment, and it will of itfelf move round 
the Iron Globe from Weft to Eaft in a circular Orbit, 
if the Hoop be circular and the Globe ftand over the 
Centre of it, but in an Elliptic Orbit with the fame 
Excentricity, if the Globe does not ftand in the Centre 
of the Hoop, as in the firft Experiment, when the 
Globe does not ftand on the Centre of the Cake. 
[What will happen if the Hoop be Elliptic, he did 
not mention 5 I fuppofe, he had not an oval Glafs 
Hoop by him.] 
Experiment III. 
This fame Iron Globe being fet on the bare Table, 
without either the Cake of Rofin or Glafs Hoop, the 
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