THE CATEGORIES OF ANALOGY. 279 



and of the Eodentia, and between some of the family of 

 Bombyces and of the Papiliones, etc. 



Specific Analogies. If the characteristic features of 

 species be truly found in the relations which animals bear 

 to the surrounding world or to one another, and in the 

 relative proportions of their parts, and their ornamenta- 

 tion, we cannot fail to find specific analogies resulting 

 from these different aspects in animals belonging to dif- 

 ferent genera, to different families, to different orders, and 

 even to different classes and branches. As far as they 

 are aquatic, animals belonging to different genera which 

 number terrestrial species also, have a certain analogy 

 with one another. All animals living in pairs or in flocks, 

 or isolated, may in this respect be considered as having 

 an analogy to one another, especially if they belong to 

 genera in which different species bear these different rela- 

 tions to one another. But it is in the proportions of the 

 parts to one another in the species of different genera 

 belonging to the same family or even to different families 

 of the same class, and in the ornamentation of their sur- 

 face, that we observe the most numerous specific analogies. 

 Reference has already been made to the specific homolo- 

 gies resulting from the relative length of the head, the 

 neck, the tail, etc. But there is a specific analogy only 

 between the Zerda, a species of dog found in the interior 

 of Africa, which is characterized by the extraordinary 

 length of its ears, and those species of hare which live also 

 in the desert, and have much larger and longer ears than 

 those inhabiting the woods and marshes. This analogy is 

 no doubt owing to the fact that under the conditions in 

 which these animals are placed, they require a keener 

 perception of sound, and yet they belong to different 

 orders, though of the same class. This is therefore a spe- 



