ORIGIN OF A POLYDACTYLOUS RACE OF GUINEA-PIGS. 25 



Table 2. — Character of the extra-toe in young 0/ $ 2^ [FN), 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), getieration 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. 



