II
The brain is the alembic to which the Animal conveys what each of its organizations, in proportion to the strength of that vessel, can absorb of that Substance, which returns it transformed into Will.
The Will is a fluid inherent in every creature endowed with motion. Hence the innumerable forms assumed by the Animal, the results of its combinations with that Substance. The Animal's instincts are the product of the coercion of the environment in which it develops. Hence its variety.