its natural ftation with refpedt to others: two of thefe meet- 
ing, tnay coalefce, and make one Terrel/amd one Atmoj^here -^ 
many of them will make a Terra. If two or more of thefe *^ 
touch, and do not mix, they will be difficult to be feparated : 
the more there are of the^e in the fame fpace, the harder they 
will be to be feparated : hence he deduces a Problem, That 
'tis poffible to dimini(h Bodies, that the Coherence thence 
arifing (hall be greater than a given Power : this he fuppofes 
the caufe of Hardnefs. His next Pofition is. That a heating 
Globule immers'd in a terminated Fluid, whether Spherical, 
or Oval, will fettle it felf in the Center of Gravity of it: but 
if through this Fluid there be a palTage to another Fluid, the 
heating Body will be put out of that Center into the Focm 
of the Oval : The Conflift between the included and paffing 
Particles will create a Vertex, whofe included matter fliall 
move exadly as the Elliptical Hypothefis of the Planets fup- 
pofes, and anfvver not only to that but to any other Hypo- 
thefis. 
The Application of this Hypothefis he explains in a Letter 
to Mx. Afion 5 in which he expreffes his Efteem of Ar/Jiarchus^ 
the vindicating whofe Honour, put him, about two years 
fince, upon thefe Principles, which he in the interim digeft- 
ed, and fent to the Oxford Society 3 from whom receiving 
no Ob jeftions, bethought good to publifhnows and that 
becaufe they will ferve to explain not only the Arifiarchian 
but the Ptolomaick^, Ty€homc\^ and perhaps any other Syftem 
of the World, and any kind of Philofophy, not ridiculous at 
firft fight, whether a Vacmm be aflerted or denied. But as 
to Elapicity^ he does not afferc thefe Principles to have given 
the only caufe, nor that they can explain Vegetation without 
an Anima 5 but he fuppofes them fufficient to explain Cohe- 
fion. He explains a threefold effeft of Preflfure^ i. That 
which afts on a Body in its own place : 2. That which pref- 
fesit towards the Center when out of its place: 3. The dif- 
ference between the Moment and Impediment tending up- 
wards or downwards. Thus far he communicated to the 
Oxford 
