ORIGIN OF A POLYDACTYLOUS RACE OF GUINEA-PIGS. 25 

 TABLE 2. Character of the extra-toe in young of $ 23 (/W), of polydactylous generation I. 



TABLE 3.* Character of the extra-toe in young of $ 193 (ff), generation II. 



TABLE 4. Character of the extra-toe in young of $ 628 ( GF), generation III. 



TABLE 5. Character of the extra-toe in young of $ 635 (FF), generation III. 



*In the last two columns of tables 3 to 13, per cent, or grades of the young, when based on a 

 smaller number of individuals than four, are placed within brackets. 



