GENETIC TYPE AND THE ENDOCRINES 351 



in texture from soft and silky to rather coarse and hard. 

 This would indicate a rather complex basis for the feathery 

 hair and plume-like coat of the Pekingese. In color, the 

 coats are various combinations of the parental stocks black 

 and various shades of red with white spotting. By chance 

 an albino factor was carried in one of the parent breed lines 

 and the brother-sister matings among the FI hybrids brought 

 out this recessive factor. The albino dog is shown in figure 

 2 of plate 69. In not one of these hybrids is the tail held 

 curled over the rump, Pekingese fashion. Such a tail position, 

 characteristic of the Pekingese and Pomeranian poodle as 

 well as the chow and other Asiatic dogs, would seem from 

 this cross to be a character of complex genetics. All the F 2 

 animals have short achondroplasic legs, typical for both the 

 dachshund and the Pekingese parent stocks, and the large 

 ears of the dachshund are found to be quite dominant. The 

 various head shapes in these hybrids are shown in plate 69 

 and again in profile in plate 70. 



Beginning with figures 1 and 2 (pi. 70), 2213 $ and 2093 $ , 

 the cranial region is seen to be rounded or almost spherical, 

 and as we continue toward the right it becomes progressively 

 longer until in figure 7 we find an almost typical dachshund 

 outline. In this head there is almost no "stop," or depression 

 of the nasion, which is so pronounced in figures 1-4. These 

 heads range from long and slender with long normal muzzles 

 and shallow nasion depressions to those with short deep muz- 

 zles and high rounded foreheads. In none of the F 2 hybrids, 

 however, is the muzzle so completely short as to give the flat 

 Pekingese face, even though in a few it is greatly reduced 

 and similar to what may be found in a poorly typed pure 

 Pekingese. 



The dental occlusion in these hybrids varies in a most 

 significant manner. A few of them show the upper and lower 

 jaws to be of about equal length with normal occlusion of 

 the incisors; about the same number are slightly undershot 

 having the lower incisors rising in front of the upper, the 



