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Classification of the Sci
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between the various phenomena that we attribute to one instinct. Our decision upon this question has to issue from such good sense as we can muster. This good sense, as an instinct, itself, will be a pretty fair guide, as guides go, though it ought to be subjected to checks that, in the present state of our knowledge, we are seldom in condition to apply to it. Mistakes, which infest all human work, have to be expected here, or at least greatly dreaded, in malignant swarms.

Such being the sense in which the word instinct is here to be used, let us recur to the remark that the instincts clustering about food and the instinct clustering about reproduction are the two divisions of instinct. The former group govern man's treatment of things, the latter his dealings with fellow beings. The former is physical, the latter psychical; the former suicultural,* the latter altercultural and publicultural. In order to find the natural classification, we must intro-

*This word has a Lewiscarrollesque quality; for it can be regarded as referring to culture of oneself (sui) or to culture of a swine (suis).