The primary object of the present work, is to give as correct and comprehensive a view of the animals composing the Ox Tribe, as the present state of our knowledge will admit, accompanied by authentic figures of all the known species and the more remarkable varieties. Ruminantia is the term used by naturalists to designate those mammiferous quadrupeds which chew the cud; or, in other words, which swallow their food, in the first instance, with a very slight mastication, and afterwards regurgitate it, in order that it may undergo a second and more complete mastication: this second operation is called ruminating, or chewing the cud.