GENETIC TYPE AND THE ENDOCEINES 643 



to that in text-figure 113 above. In the same manner, points 

 on line co of cdo represent the differences in excitability of 

 the motor reaction systems of the segments. The other vertical 

 planes represent other systems of the organism, as for ex- 

 ample, the emotional, cfo; the sensory, gho; adrenal action, 

 Imo ; thyroid action, npo ; etc. Within an organism the action 

 of each system bears a relationship to the others, and this 

 relationship differs for the pure and mixed type dogs. For 

 example, a pure excitable type, in which there is a harmonious 

 relationship between the parts, may be represented by line 

 X joining systems of equal excitability and harmonious na- 

 ture. On the other hand, the inactive type would be repre- 

 sented by line Y joining systems at the inactive end of the 

 scale but of equal excitability and harmonious nature. A 

 mixed type may be represented by line Z in which case the 

 points representing excitability are not equally distant from 

 the center o, but at unequal distances, which represents dis- 

 harmony, that is, each part is not harmoniously related to 

 the other. The possibilities for variation within any one of 

 the systems of the body, and the degree of variation within 

 any one system, or all systems, determine the degree of 

 mixed behavioral type. 



The representation of constitution given here is not com- 

 plete. Other dimensions should be considered before a total 

 picture of the pure lethargic constitutional type or the pure 

 active type is obtained. However, these experiments do in- 

 dicate what we believe to be the significant factors in con- 

 stitutional differences and the approach to a further analysis 

 of the problem. 



