When we see that a weak solution of sulphuric acid is capable of
disengaging from the blood the scent of the animal, we shall then bear
in mind that this odorous emanation contains particles of all the scents
peculiar to each tissue and organ of the animal. When we further say
that each organ in a living animal draws by selective affinity from the
blood those materials which are necessary for its sustenance, we must
not forget that each organ draws at the same time by a similar selective
affinity the specific odorous substances requisite for its constructive
requirements.
We have now only to suppose that the embryonal germ contains, like the
blood itself, all the odorous substances pertaining to the various
tissues and organs of the parent, and we shall understand which is the
moving principle in the germ that evolves an offspring, shaped in the
image and after the likeness of the parents.
In plants it is the blossom which is entrusted with the function of
reproduction, and the odorous emanations accompanying that process are
well known.
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