This constant conjunction sufficiently proves that the one part is the cause of the other.

We must, however, beware not to draw such a conclusion from a few experiments."-- (I.
p.

230.) Lastly, the following rule, though awkwardly stated, contains a suggestion of the _method of residues_:-- " ...

an object which exists for any time in its full perfection without any effect, is not the sole cause of that effect, but requires to be assisted by some other principle, which may forward its influence and operation.

For as like effects necessarily follow from like causes, and in a contiguous time and place, their separation for a moment shows that these causes are not complete ones."-- (I.p.