. Beginners' Zoology . ,such as short-horn, Jersey, etc., allform one species of animals, having thescientific name taiirus. Let us includein a larger group the animals closestakin to a cow. We see a cat, a bison,and a dog; rejecting the cat and thedog, we see that the bison has horns,hoofs, and other similarities. We ^lude it with the cow in a ge7ius calledBRANE formed of one Bos, Calling the COW Bos taurus, and layer of cells. A few , , . t-. i • t^i i cells secrete mucus. the bison, Bos bisou. The sacrcd cow of India (Bos indicus) is so like the cow and the buffalo as a
. Beginners' Zoology . ,such as short-horn, Jersey, etc., allform one species of animals, having thescientific name taiirus. Let us includein a larger group the animals closestakin to a cow. We see a cat, a bison,and a dog; rejecting the cat and thedog, we see that the bison has horns,hoofs, and other similarities. We ^lude it with the cow in a ge7ius calledBRANE formed of one Bos, Calling the COW Bos taurus, and layer of cells. A few , , . t-. i • t^i i cells secrete mucus. the bison, Bos bisou. The sacrcd cow of India (Bos indicus) is so like the cow and the buffalo as also to belong to the genus Bos. Why is not the camel, which, like Bos bison, has a hump, placed in the genus Bos? The Old World buffaloes, — most abundant in Africaand India, — the antelopes, sheep, goats, and several othergenera are placed with the genus Bos in a family calledthe Jiollozv-Jionied animals. This family, because of its even number of toes andthe habit of chewing the cud, resembles the camel family,. THE PRINCIPLES OF BIOLOGY 9 the deer family, and several other families. These are allplaced together in the next higher systematic unit calledan order, in this case, the order of rmni7iants. The ruminants, because they are covered with hairand nourish the young with milk, are in every essentialrespect related to the one-toed horses, the beasts ofprey, the apes, etc. Hence they are all placed in amore inclusive division of animals, the class calledmammals. All mammals have the skeleton, or support of thebody, on the inside, the axis of which is called the verte-bral column. This feature also belongs to the classesof reptiles, amphibians, and fishes. It is thereforeconsistent to unite these classes by a general idea orconception into a great branch of animals called thevertebrates. Returning from the general to the particular by succes-sive steps, state the branch, class, order, family, genus,and species to which the cow belongs. The Eight Branches or Sub-kingdom
Size: 970px × 2577px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1920, bookidbeginnerszoo, bookyear1922
