higher way, through something in the living thing itself, which is
the semen containing the principle productive of the body. Therefore
there must be in the living thing a power that prepares this semen;
and this is the generative power.

Reply Obj. 3: Since the generation of living things is from a semen,
it is necessary that in the beginning an animal of small size be
generated. For this reason it must have a power in the soul, whereby
it is brought to its appropriate size. But the inanimate body is
generated from determinate matter by an extrinsic agent; therefore
it receives at once its nature and its quantity, according to the
condition of the matter.

Reply Obj. 4: As we have said above (A. 1), the operation of the
vegetative principle is performed by means of heat, the property of
which is to consume humidity. Therefore, in order to restore the
humidity thus lost, the nutritive power is required, whereby the food
is changed into the substance of the body. This is also necessary for
the action of the augmentative and generative powers.
_______________________

THIRD ARTICLE [I, Q. 78, Art. 3]

Whether the Five Exterior Senses Are Properly Distinguished?

Objection 1: It would seem inaccurate to distinguish five exterior
senses. For sense can know accidents. But there are many kinds of
accidents. Therefore, as powers are distinguished by their objects,
it seems that the senses are multiplied according to the number of
the kinds of accidents.

Obj. 2: Further, magnitude and shape, and other things which are
called "common sensibles," are "not sensibles by accident," but are
contradistinguished from them by the Philosopher (De Anima ii, 6).
Now the diversity of objects, as such, diversifies the powers. Since,
therefore, magnitude and shape are further from color than sound is,
it seems that there is much more need for another sensitive power
than can grasp magnitude or shape than for that which grasps color or
sound.

Obj. 3: Further, one sense regards one contrariety; as sight regards
white and black. But the sense of touch grasps several contraries;
such as hot or cold, damp or dry, and suchlike. Therefore it is not a
single sense but several. Therefore there are more than five senses.

Obj. 4: Further, a species is not divided against its genus. But
taste is a kind of touch. Therefore it should not be classed as a
distinct sense of touch.

_On the contrary,_ The Philosopher says (De Anima iii, 1): "Th