XVI CONTENTS 



PAGE 



Excessive skin urea and other disharmonies of growth in hybrids from 



breeds with bulldog deformities 328 



The bulldog modification in comparison with other short muzzled and round 



headed distortions in non-related breeds 335 



The head features in Brussels griffon-dachshund hybrids 337 



The head features in dachshund-Pekingese hybrids 343 



The F\ dachshund-Pekingese hybrids 344 



The variety of head characters in the second generation dachshund- 

 Pekingese hybrids 349 



The cross between the Pekingese and the Saluki 358 



Structural disharmony and functional maladjustment between the upper and 



lower jaws in breed hybrids 367 



The question of premanence and age of establishment for dental 



occlusion 372 



Eelation of dental occlusion to skull indices 376 



SECTION IV 



Charles R. Stockard 



A crucial test of genetic constitution as against endocrine distortion in 

 determining the type of structural formation; the "screw-tail" 

 in bulldog hybrids 38^ 



SECTION V 



Charles R. Stockard and E. M. Vicart 



Variations in proportional size and modifications in histologic quality of 

 endocrine glands in relation to body types as found among the 



dog breeds 390 



The relative sizes of thyroid glands in contrasted types of pure dog 



breeds 401 



The relative sizes of thyroids in hybrids between pure breeds of 



contrasted types 409 



Gross relative sizes of the pituitary glands in contrasted breed types 



and their hybrids 414 



Differences in the histologic qualities of thyroid glands from dogs of 



pure breed 420 



Introductory view 420 



Histologic techniques employed 422 



Survey of histologic modifications in the thyroid 423 



