Now no one indeed supposes that the chicken does what it does, with the same self-consciousness with which a tailor makes a suit of clothes. Not any one who has thought upon the subject is likely to do it so great an injustice. The probability is that it knows what it is about to an extent greater than any tailor ever did or will, for, to say the least of it, many thousands of years to come. It works with such absolute certainty and so vast an experience, that it is utterly incapable of following the operations of its own mind—as accountants have been known to add up long columns of pounds, shillings, and pence, running the three fingers of one hand, a finger for each column, up the page, and putting the result down correctly at the bottom, apparently without an effort. In the case of the accountant, we say that the processes which his mind goes through are so rapid and subtle as to elude his own power of observation as well as ours. We do not deny that his mind goes though processes of some kind; we very readily admit that it must do so, and say that these processes are so rapid and subtle, owing, as a general rule, to long experience in addition. Why then should we find it so difficult to conceive that this principle, which we observe to play so large a part in mental physiology, wherever we can observe mental physiology at all, may have a share also in the performance of intricate operations otherwise inexplicable, though the creature performing them is not man, or man only in embryo?
Again, after the chicken is hatched, it grows more feathers and bones and blood, but we still say that it knows nothing about all this. What then do we say it _does_ know? One is almost ashamed to confess that we only credit it with knowing what it appears to know by processes which we find it exceedingly easy to follow, or perhaps rather, which we find it absolutely impossible to avoid following, as recognising too great a family likeness between them, and those which are most easily followed in our own minds, to be able to sit down in comfort under a denial of the resemblance. Thus, for example, if we see a chicken running away from a fox, we do admit that the chicken knows the fox would kill it if it caught it.