110 THE GLANDS REGULATING PERSONALITY 



holes in the bronze doors, and we glimpse the unfathomable dis- 

 tances of unexplored regions. But we do see something, and we 

 do glimpse a beginning. Already the outlines of a differential 

 anatomy, and a different physiology and a differential psy- 

 chology, which will explain to us the unique in the constitution, 

 the temperament and character of an individual, emerge. It is 

 worth while, before proceeding to the details, so valuable to a 

 society which would become rational, to summarize the general 

 principles emerging, expressing the directing powers of the duct- 

 less glands over the individual. They may be regarded as the 

 present postulates of a new science of the whys and wherefores 

 separating and setting apart, as so recognizably distinct, those 

 peregrinating chemical mixtures: men and women., 



1. The life of every individual, in every stage, is dominated 

 largely by his glands of internal secretion. That is, they, as a 

 complex internal messenger and director system, control organ 

 and function, conduct and character. The orderliness of human 

 life, in the sequential march of its episodes, crises, successes and 

 failures, depends, to a large extent, upon their interactions with 

 each other and with the environment. 



2. One or several of the glands possesses a controlling or 

 superior influence above that of the others in the physiology 

 of the individual and so becomes the central gland of his life, 

 its dominant, indeed, so far as it casts a deciding vote or veto, 

 in its everyday existence and incidents as well as in its high 

 points, the climaxes and emergencies. 



3. These glandular preponderances are at the basis of per- 

 sonality, creating genius and dullard, weakling and giant, 

 Cavalier and Puritan. All human traits may be analyzed in 

 terms of them because they are expressions of them. 



4. Specific types of personality may be directly associated 

 with particular glandular prominences, so that we have the 

 thyroid-centered types, the pituitary-centered types, the adrenal- 

 centered types, etc. These are the classic Three, the prototypes in 

 their purity most easily described and recognized. 



5. Combinations of these, as well as of other glands — with 

 joint predominance — occur and indeed form the majority of 

 populations. The phenomena of varieties in species are thus 

 explained. 



6. Internal secretion traits are inherited, and variations in 

 heredity are essentially the structural representation of the re- 

 sultant of a parallelogram of forces exerted by each of the 



