RUMINANT QUADRUPEDS. 



45.> 



M'ards the base. Hence a longitudinal section of the 

 whole presents the appearance represented in the 

 annexed figures (-218*), where a is the section of the 

 horn of an Ox, and b, a similar section of the horn 



of an Antelope. C is a magnified view of the ex- 

 tremity of the latter, together with a portion of the 

 bone (d), which occupies the axis of the horn. 



In this process of the formation of horn, as hap- 

 pens in that of shells, there sometimes occur irre- 

 gularities, or periodical intermissions and increase 

 of action in the secreting organs, giving rise to 

 transverse grooves, or ridges. These may be seen 

 in the horns of the Goat, in which the fibres are 

 short, and laid one over another with the same re- 

 gularity as the tiles of a house. The tendency in 

 these horns to assume a spiral form is explicable 



