Page:Popular Science Monthly Volume 44.djvu/779

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761
THE METHOD OF HOMING PIGEONS.

animals, by the processes going on in their bodies, must have some notion of time. This would give the "how long" element in the problem. The "how fast" might be given by such an instrument

PSM V44 D779 Flight of six pigeons covered cage.jpg
Fig. 2.
Flight of six pigeons, covered cage.

as we find in the otoliths resting on the sensory hairs of the maculæ acousticæ; these hairs bending under the weight more or less, according to rate of movement. The "which way" could