5o6 PRIMARY FACTORS OF ORGANIC EVOLUTION. 



The relation of consciousness to the physical basis 

 is as yet a profound mystery, but that they exercise 

 over each other a definite mutual control is unques- 

 tionable. The processes which produce thought, as 

 conception, judgment, etc., are, however, not qualita- 

 tively related to the amount of nutritious proteids 

 consumed in the central nervous system, but only 

 quantitatively; yet it is the outcome of these processes 

 that directs animal movements, when they are not auto- 

 matic. In other words, the forms of thought, which 

 have no weight, direct the movements of muscles, 

 which have weight. This is not in accord with the 

 doctrine of the correlation of energy. But what has 

 the formation of a concept, or the development of a 

 judgment, to do, per se, with the correlation of energy? 

 I may give this idea a more definite expression by the 

 following diagram : i 



Let each square represent the grammes of energy 

 necessary for the maintenance in consciousness of six 

 propositions. Judgment issues from the side of the 

 predominating number of propositions. They arrange 

 themselves in consciousness in accordance with their 

 qualities, in two aggregations represented by columns 

 in the squares. Now if they arrange themselves in 

 four affirmative and two negative, as in square i, the 



IThis is in explanation of the same proposition as stated by me in the 

 Proceedings of the American Philosophical Society, i88g, p. 504. 



