ABSTRACT
F O R mankind as for the other higher animals, the life of the species is conditioned by the complement of i n stinctive proclivities and tropismatic aptitudes w i t h which the species is typical ly endowed. N o t only is the continued life of the race dependent on the adequacy of its instinctive proclivities i n this way, bu t the routine and details of its life are also, i n the last resort, deter mined by these instincts. These are the prime movers in human behaviour, as in the behaviour of all those animals that show self-direction or discretion. H u m a n activity, i n so far as i t can be spoken of as conduct, can never exceed the scope of these instinctive dispositions, by in i t ia t ive of which man takes action. No th ing falls w i t h i n the human scheme of things desirable to be done except what answers to these native proclivities of man. These native proclivities alone make anything wor th while, and out of their working emerge not only the purpose and efficiency of life, bu t i ts substantial pleas ures and pains as well .
