268 



CHARLES R. STOCKARD AND A. L. JOHNSON 



Seven cranial indices are given for the skulls of hybrids 

 derived from crosses between the F x and F 2 generations. 

 These indices have a wide range and are quite comparable 

 to those of the F L > group. The F 2 female employed in pro- 

 ducing these hybrids was almost indistinguishable in type 

 from an F, animal. Therefore her progeny, sired by an F x 



CRANIAL INDEX 



BCD E 



SKULL INDEX 



I 



PALATAL INDEX 



Text-figure 61. Dachshund-French bulldog cross. Each vertical Hue represents 

 an index based on exact measurements of the skull, and the same series of skulls 

 was used for the three charts. A, dachshund; B, French bulldog; C, F, ; 1), F 2 ; 

 E, F, X F 2 . 



male, might be expected to follow rather closely the true 

 F 2 group. 



The total skull indices represented by the middle chart in 

 text-figure 61 furnish a much wider contrast between the two 

 pure types than do the cranial indices discussed above. Five 

 dachshund skulls range for total skull index from 62 to 67. 

 Four French bulldog skulls range in total skull index from 

 !)4 to 111, two of these being almost as wide as long and 



