Page:The Zoologist, 4th series, vol 5 (1901).djvu/349



all our conceptions of Animal Mimicry and Protective Resemblance is the predicate that other animals see the various objects of nature in similar size, shape, and colour as we do ourselves; in other words, that, though the sensory organs of sight may vary, the practical result is still identical. The same remark applies in a general way to a belief in a more or less universal and similar sensation of touch, smell, taste, and hearing, though on examination it is surprising to find how little positive information exists to warrant the conclusion, even though it may be an absolute fact. If Berkeley asked the old materialistic philosophers whether they could prove the existence of a material world external to the mind, may we not also ask for some more definite proof of the unity and similarity in the sense perception Zool. 4th ser. vol, V., September, 1901.