GENETIC TYPE AND THE ENDOCRINES 581 



the top, group B at the bottom, and the intermediates distri- 

 buted between the two polar groups. 



Initial adjustment to laboratory. The initial behavior, or 

 adjustment to the laboratory, has been discussed in the food 

 taking situation. The dogs which had not been trained were 

 taught to take food from the pan even though the conditioned 

 salivary reaction was not specifically studied. In these cases, 

 food acted only as an incentive. The shock, or unconditioned 

 stimulus, was not applied until each dog was thoroughly ac- 

 quainted with the laboratory and took food without hesita- 

 tion. The difference in time required to make the adjustment 

 to the laboratory is shown for all dogs in column 1 of table 7. 

 The dogs of the active group B require from 10 to 15 days 

 training before they will stand in the harness. The Saluki 

 and German shepherd are typical of this group. In contrast 

 to this, the bassethound, typical of the lethargic group A, 

 remained quietly on the platform the first day and the initial 

 reaction to the shock could be determined at once. Other 

 dogs of the group fall between these two extremes. For 

 example, one bassethound-German shepherd F 2 required 7 

 days' adjustment to the laboratory, another 5 days', and a 

 third 4 days'. A bassethound-Saluki F 2 required 10 days for 

 adjustment to the experimental room. These differences in- 

 dicate the degree of sensitivity to environmental factors and 

 are thus of significance in contrasting the types. 



Strength of shock necessary to elicit the flexion of the 

 fort leg and the effect of the shock on the dog. In the case 

 of the Harvard inductorium, the secondary coil is supported 

 by parallel bars in such a manner that this coil can be moved 

 away from the primary coil, thus increasing the distance 

 between them. The bars supporting the secondary coil are 

 graduated in centimeters so the exact distance between the 

 primary and secondary can easily be determined. At zero 

 reading the secondary coil is directly over the primary and 

 gives the maximum induced current. As the secondary coil 

 is moved away from the primary, to 1, 2, 3, etc., centimeter 

 readings, the induced current becomes weaker. In determining 



