In the Second, he examines thtChau^h, which he knowsin Mat- 
iter,and makes it his bufinek to explicate all thofe that refpedfc Quaxtitn 
3 . In the third , he 'explains the Motion of Artificial Engins, and that 
of Natural ones, by one and the fame Caufe ; endeavouring among 
other things to ftiew, that the Body of an Animal is moved after the 
fame manner with a Watch. That caufe of motion he makes the Mate- 
ria Subtilis j and the finer or fubtiler that is, thebetter and fitter he 
conceives it to be to preferve Motion. 
4. In the Fourth^ he teaches, that though Experience Teems to evince 
that the Soul moves the Body, and that one Body moves an other • yet 
there is nothing, but God , that can produce any motion in the World, 
and all other ^Agents , which we believe to be the Caufe of this or 
that Motion , are no more but the Occaficn thereof. In doing this s 
he advances certain Axioms^ and Conclusion?, which are in fhort, 
a. The Axioms: That no fubftance has'that of it felf , which it can 
loofe, without ceafing to be , what it is t That every body may loofe 
of its motion , till it have no more left, without ceafing to be a Body $ 
That we cannot conceive but two forts of fubftances, vid. a Spirit ( or 
That which thinketh) and a Body r wherefore they muft be confidered 
as the Caufes of all, that happens , and what cannot proceed from the 
one , mufl; neceffarily be adfcribed to the other ; That to Move , o.r to 
caufemotion, is an Adtion : That-an Aftion cannot be continued but by 
the Agent, who began it. 
b. The Contingent ^ That no Body hath Motion of it felf: That 
the Firft Mover of Bodies is not a Body: That.itcannot be but a Spirit t 
that is the Firft Mover ? That it cannot be but the fame Spirit, who has 
begun to move Bodies, that continues to move. 
In the fifth , He treats of theUnion of the Body and Soul , and the 
mr nner, how they a& one upon the other j and efteems it not more 
difficult to conceive the Adhon of Spirits upon Bodies , and of Bodies 
upon Spirits , than to conceive the Adion of Bodies upon Bodies : the 
caufe of the great difficulty in underftanding the two former , arifing 
(according to him) from tnence , that we will coneeive the one by the 
other, not confidering , that every thing adting according to its own 
nature, wefhall never know the adtion of one A gent, if we will exa= 
. mine it by the notions we have of another , that is of a quite differing 
nature. Here he notes , that the Adtion of Bodies upon Bodies is not 
more 
