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 were produced otherwise than by direct human agency. I doubt not that the dog is considerably surprised when he hears his master's voice coming out of a box.

The adult savage, on his first introduction to a telephone, rushes around to the adjoining room to find the man who is talking through the partition. Is this act instinctive? No. Out of his limited experience, out of his limited knowledge of physics, he reasons that the only explanation possible is that a man is in the other room talking through the partition.

But that savage cannot be fooled by a handmirror. We must go lower down in the animal scale, to the monkey. The monkey swiftly learns that the monkey it sees is not in the glass, wherefore it reaches craftily behind the glass. Is this instinct? No. It is rudimentary reasoning. Lower than the monkey in the scale of brain is the robin, and the robin fights its reflection in the window-pane. Now climb with me for a space. From the robin to the monkey, where is the impassable gulf? and where is the impassable gulf between the monkey and the feeding-child? between the feeding-child and the savage who seeks the man behind the partition? aye,