The intellectual evolution of the race consists in an increase in the number, delicacy, complexity, permanence and speed of formation of such associations.

It will of course, be understood that directly or indirectly, soon or late, every advance in the sciences of human nature will contribute to our success in controlling human nature and changing it to the advantage of the common wheel.

From the lowest animals of which we can affirm intelligence up to man this type of intellect is found.

Amongst the minds of animals that of man leads, not as a demigod from another planet, but as a king from the same race.

Whatever exists at all exists in some amount. To know it thoroughly involves knowing its quantity as well as its quality.

The restriction of studies of human intellect and character to studies of conscious states was not without influence on a scientific studies of animal psychology.

For origin and development of human faculty we must look to these processes of association in lower animals.