If it is true that...

The genus signifies indeterminately the whole that is in the species and does not signify matter alone

and

Similarly, the difference also signifies the whole and does not signify the form alone

Then it must be true that...

The definition or the species signifies the whole

If it is true that...

The definition or the species signifies the whole

and

The genus is taken from the matter as signifying the whole

Then it must be true that...

The difference is taken from the form as signifying the whole