The observer may, in spite of the indifference of the two sides to one another, set to work to determine correlations, supported partly by the general rational principle that the outer is the expression of the inner, and partly by the analogy of the skulls of animals-which may doubtless have a simpler character than men, but of which at the same time it becomes just so much the more difficult to say what character they do have, in that it cannot be so easy for any man's imagination to think himself really into the nature of an animal. Should the observer do so, he will find, in giving out for certain the laws he maintains he has discovered, a first-rate means of assistance in a distinction which we too must necessarily take note of at this point.
aldez, animalien garezurren analogiak babestuta, gizakiarenak baina izaera sinpleagoa izan ei dutenak baina horietaz zailagoa gertatzen delarik esatea zein izaera duten, gizaki bakoitzaren errepresentazioarentzat hain erraza ezin baitaiteke izan animali baten izaeran sartzea), orduan behatzaileak aurkitu omen dituen legeak ziurtatzerakoan laguntza ezin hobea aurkitzen du hemen guri halabeharrez bururatu behar zaigun bereizketa batean.