There is strong reason to believe that something similar
prevails in the case of animals, as may be seen from an examination of
what embryologists call the aura seminalis.
Let us now inquire what the effects are of odours generated in the outer
world on animals. The odorous impressions produced may be pleasant or
unpleasant, pleasant to one and unpleasant to another animal. What is
it that constitutes this sensation of pleasure or displeasure?
Professor Yaeger answers, It is harmony or disharmony which makes all
the difference. The olfactory organs of each animal are impregnated by
its own specific scent. Whenever the odorous waves of a substance
harmonize in their vibration with the odorous waves emanating from the
animal; in other words, whenever they fall in and agree with each
other, an agreeable sensation is produced; whenever the reverse takes
places, the sensation is disagreeable. In this way it is that the odour
regulates the choice of the food on the part of the animal. In a
similar way the sympathies and antipathies between the various animals
are regulated.
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