ertain, enduring and unalloyed Good through the union of mind with the whole of nature is the theme developed in detail in the Ethics. There results aphilosophy which unites the Greek idea that man's highest good is demonstrative ra- tional knowledge of immutable Being jthe Hebrew and Chris- tian conviction that the soul is capable of away of life which secures constant and pure blessedness, and the premises and method of the new science, as he saw the latter. Nature was completely intelligible jit was at one with mindj to apprehend nature as awhole was to attain acognitive certainty which also afforded acomplete certainty of good for the purpose of con- trol of appetite, desire and affection this latter specification being one which Greek thought did not include and which it doubtless would have thought the height of presumption to lay claim to. Right ordering of human conduct, knowledge of the highest reality, the enjoyment of the most complete and unvarying value or good, were combined in one inclusive whole by means of adoption of the ideas of the complete interdepen- dence of all things according to universal and necessary law an idea which he found to be the basis of natural science.