ENLARGEMENT OF PARTS FROM USE. 25 



Isidore Geoffrey Saint-Hilaire * describes and figures 

 the head of a duck with a tuft of feathers on the occiput 

 and a foot. In describing the foot Saint-Hilaire states 

 that the cranium underlying the tuft was defective, and 

 especially notes that the cranial opening was similar to 

 that found in " les poules a tete huppee." 



FIG. 14. Head of a.,duckling with a tumour and abnormal foot 

 growing from the occiput. 



During life this foot, like the normal pair, was of a 

 beautiful orange-yellow colour. Some who saw the duck 

 were suspicious that the foot had been engrafted on to the 

 occiput accidentally : such an opinion had no foundation. 



1 " Des Anomalies de Torganisation chez Phomme et les Ani- 

 maux," tome iii. p. 194. 



