promptings of Compassion. The explanation of the possibility of this extraordinary phaenomenon is, however, not so easy; nor is it to be reached by the path of pure psychology, as Cassina supposed.

The key can be furnished by Metaphysics alone; and this I shall attempt to give in the last Part of the present treatise.

I now turn to consider the derivation of actions of real moral worth from the source which has been indicated. The general rule by which to test such conduct, and which, consequently, is the leading principle of Ethics, I have already enlarged upon in the foregoing Part, and enunciated as follows: Neminem laede; immo omnes, quantum potes, juva. (Do harm to no one; but rather help all people, as far as lies in your power.) As this formula contains two clauses, so the actions corresponding to it fall naturally into two classes.