Abstract
On inquiry and examination of the literature I have failed to find a single clear case of a salmon returning to its natal river from a distant place in the sea, that is, away from the neighborhood of the river mouth. Admittedly this is a difficult thing to prove, since we must be sure of three things for the individual fish: (1) Which is the natal river? (2) where it has been in the sea, and (3) that it is again in its river. Perhaps some one may be able to produce such evidence. Without it, however, it seems pointless to speak of a homing instinct.
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