XIV CONTENTS 



PAGE 



The bassethound and English bulldog hybrids in connection with dwarf 



leg growth 90 



Test for absence of achondroplasia in the legs of the bulldog 91 



Leg growth in the bassethound-bulldog F, hybrids 94 



Leg growth in the bassethound-bulldog Fa hybrids 95 



The Fj bassethound-bulldog backcrossed with each of the parent stocks 101 



The effects of different breed constitutions on the fundamental growth 

 pattern of the limb skeleton as responses to a single gene or 

 to a homozygous allelic pair 103 



Leg skeletons of the Fa bassethound-shepherd Ill 



Leg skeletons of the F 2 bassethound-Saluki 113 



Leg skeletons of the Fa bassethound-bulldog 118 



Localized achondroplasia in the extremities of the dachshund and the 



Pekingese 124 



The extremities in the dachshund-Boston terrier cross 125 



Leg skeletons of the dachshund-Boston terrier hybrids 130 



Dachshund-French bulldog cross for extremity types 134 



Dachshund-Brussels griffon cross for extremity types 135 



The extremities in the hybrids between the Pekingese and Saluki 137 



Testing the location of the gene which induces achondroplasia of the 

 extremities by crossing the dachshund with the bassethound and 

 with the Pekingese 140 



SECTION III 



CHARLES R. STOCKARD AND A. L. JOHNSON 



The contrasted patterns and modifications of head types and forms in the 

 pure breeds of dogs and their hybrids as the results of genetic 

 and endocrinic reactions 149 



The problems involved in the study of head types among dogs 149 



The normal or standard dog skull 152 



Comparisons of linear measurements made on a group of seventy adult 

 dog skulls including various breeds from the large St. Bernards 

 and great Danes to the small Pekingese and toy dogs 156 



Zygomatic widths compared with other skull widths 156 



A comparison of widths at different cranial regions 163 



A comparison of cranial height and width measurements among 



different breeds . 167 



