248 GENERATION. 



action, must produce an action in some common part of the brain, in 

 order to put it into motion. 



Do not monsters show that the mind and the formation of the body- 

 do not necessarily correspond ? — that is to say, that the formation of 

 the mind does not arise out of the formation of the parts ; for 

 although the body may be strangely formed, yet the mind, if properly 

 formed, shall have all the natural dispositions for the natural actions of 

 the body ; just as if the body had been perfectly formed in correspond- 

 ence with the brain ; but as the parts are not formed for such action, 

 they cannot be complicated. My monstrous horse, although the penis 

 stood out behind, when erected, and did not come along the belly, yet 

 leaped upon the mare to cover her, which he certainly would not have 

 done if the instinctive principle of action had arisen out of the con- 

 struction of the parts. 



Are particular Species subject to peculiar Monstrosities ? 



It is more than probable that monsters are common to every animal ; 

 at least it appears so by all those we are acquainted with. From the 

 rarity of any peculiarity in the production of malformations of any par- 

 ticular kind of animals, one would be inclined to believe that there is 

 but one principle governing these formations. However, there are 

 some animals that have a species of malformation peculiar to them- 

 selves, viz. the elephant-pig 1 , which I never saw belonging to any 

 other animal 2 . 



Classification of Monsters. 



Of monsters there are two principal classes, viz. Duplicity of Parts 

 and Deficiency of Parts ; and there is a third class, viz. Bad Forma- 

 tion. The first is, by much, the most frequent 3 . 



1 [The malformation alluded to is an appendage to the face like a proboscis, and 

 is illustrated in the Hunterian Collection by young specimens of Sus scrofa : see 

 Hunt. Preps. Series of Monsters, Nos. 160-162.] 



3 [Sir Hans Sloane possessed one such in the human subject, which, with other 

 anatomical specimens, was transferred from the British Museum to the Museum of 

 the Eoyal College of Surgeons. It is now No. 159, ' Catalogue of Monsters and 

 Malformations,' 4to. p. 45.] 



3 [The specimens of monsters and malformations in the Hunterian Collection 

 were arranged by its founder under the following heads : — 

 I. Preternatural situation of parts. 

 II. Addition of parts. 



III. Deficiency of parts. 



TV. Combined addition and deficiency of parts, as in hermaphroditical mal- 

 formation. 



For other classifications prior and subsequent to the time of Hunter, see my 

 ' Note' to the Paper on the ''Extraordinary Pheasant," in the 'Animal Economy,' 

 cd. 1837, p. 44.] 



