Moreover, a large part is reserved for purely vegetative life in animals of the highest order. The entire organism is formed without any intervention of the animal mind. Again, a certain number of organs always escape more or less from the influence of the latter, and seem to be subject to life alone. Now these organs are precisely those upon which _nutrition_, and consequently the constitution and duration of the whole, depend. Thus life, which reigned supreme in the vegetable kingdom, now in its turn, appears in a subordinate character. We might say that it was essentially entrusted with the organisation and maintenance of the instruments of the animal mind. As to the latter, even where its intervention is most questioned, it is only revealed to observation by _voluntary movements_. Now personal experiment and the faculty of reasoning, are necessary to enable us to comprehend the nature, and appreciate the signification of these movements. It is only by regarding himself as normal, that man can judge of the animal, a subject to which I shall presently return. _Phenomena of four kinds_ are then characteristic of the Animal Kingdom: _phenomena of the Keplerian movement_; _physico-chemical phenomena_; _vital phenomena_; and _phenomena of voluntary movement_; attributable to the action of four forces: _gravitation_, _etherodynamy_, _life_, and the _animal mind_. VII. Although the preceding statements are so much abridged, I have thought it well to give the condensed results in the following table: