海角乐园高清版动画The Asiatic Elephants themselves vary considerably in several minor particulars, such as the comparative length and thickness of their trunks and of their tusks, the latter of which are sometimes, even in the males, of[170] very small dimensions. But these variations are evidently the result of locality and other fortuitous circumstances, the species appearing gradually to degenerate as it recedes from the tropics, and to improve as it advances towards the line. The Elephants of Ceylon are consequently in the highest esteem for size, beauty, and hardihood, and those of Pegu are but little inferior to them; while those of the northern districts of India are held in comparatively trifling estimation.They are frequently divided into two great sections; the one, which is by far the most numerous, comprehending[234] all those in which the poison-fangs are wanting, and which are consequently dangerous only in proportion to the extent of their muscular force; and the other consisting of those in which the fangs are present, and the bite of which is accompanied with the pouring out of a venomous secretion. At the head of the first of these divisions rank the Boas, which in the Linnean arrangement comprehended all those snakes, whether venomous or not, whose under surface was covered with narrow transverse plates, and whose tail was destitute of rattle. Later zoologists have, however, confined that appellation to those among the Linnean Boas, which are without poisonous fangs and have claws near the vent, and have regarded as a distinct genus the snakes which in addition to these latter characters have the scales of the under surface of the tail so arranged as to form two distinct rows. To the latter, which inh