XV111 CONTENTS 



PAGE 



Characteristics of the active mode of performance, group B 553 



Reactions of the active group to negative signals 556 



Eeactions of the active group to other signals 558 



Response of the active group to intense auditory stimuli 558 



Summary 559 



Intermediate groups 560 



Lethargic type A-plus 560 



Active type B-minus 564 



Summary 568 



Discussion 568 



Analysis of behavior in a conditioned avoiding situation 575 



Initial adjustment to the laboratory 581 



Strength of shock necessary to elicit the flexion of the foreleg and 



the effect of the shock on the dog 581 



Nature and course of the reaction 583 



Reaction time 584 



Behavior during the interval between conditioning signals 58:1 



Generalization 587 



Excitation-inhibition ratio 588 



Intermediate groups A-plus and B-minus 590 



Summary and discussion 590 



Untrainable types 594 



Behavioral type and its relation to physical form 598 



Bassethound-German shepherd F,s 603 



Behavior classification of F,s 604 



Bassethound-shepherd F 2 s 606 



Behavior classification of bassethound-shepherd F,s 609 



Bassethound-German shepherd F, backcrossed on bassethound 611 



Five offspring of the two above animals, 709 ^ and 710 $ 612 



General summary of the bassethound and shepherd crosses 613 



Study of dogs showing exaggerated deviations in physical form from 



the more normal types 614 



English bulldog 614 



Behavior of the English bulldog 614 



Stable types produced by crossing the English bulldog with the normal 



bassethound 619 



English bulldog-bassethound F,s 619 



Behavior of English bulldog-bassethound FjS 620 



