"Along the whole line of the Andes, which form as it were the backbone of America," writes Gould, in the valuable introduction to his magnificent work on the "Trochilidæ," "at remarkably short intervals occur species of this family of birds of the greatest possible beauty, which are not only specifically but generically distinct from each other. Abundant as the species may be towards the northern and southern portions of the great chain of mountains, they vastly increase in number as we approach the equator. The equatorial regions teem with species and even genera that are not found elsewhere. Between the snow-line of the summit of the towering volcanoes and their bases many zones of temperature occur, each of which has it own especial animal and vegetable life. The Alpine region has its flora, accompanied by insects especially adapted to such situations; and attendant on these are peculiar forms of Humming Birds, which never descend to the hot valleys, and scarcely even to the cooler and more temperate paramos. Many of the higher zones of extinct and existing volcanoes have their own fauna and flora, even in the interior walls of ancient craters, wherever vegetation has gained a footing. Some species of Humming Birds have there, and there only, as yet been discovered. It is the exploration of such situations that has led to the acquisition of so many additional species of this family of birds, which now reach to more than 400. From Santa Fé de Bogota alone many thousands of skins are annually sent to London and Paris. The Indians readily learn the art of preserving them, and as a certain amount of emolument attends the collecting of these objects they often traverse great distances for the purpose of procuring them. Districts stretching more than 100 miles away from Bogota are strictly searched, and hence it is that from these places alone we receive no less than seventy species belonging to this family. In like manner the residents of many parts of Brazil employ their slaves in preparing their skins for the European markets, and many thousands are annually sent from Rio de Janeiro, Bahia, and Pernambuco; the inmates of convents are also supplied with many of the more richly-coloured species for the manufacture of feather flowers. How numerous then must these birds be in their native wilds; and how wonderfully must they keep in check the peculiar kind of insect life upon which they feed!" In disposition the Humming Birds exhibit a fearlessness and courage quite out of proportion to the delicacy of their structure, and we might cite many instances of the fierce encounters in which they sometimes engage; we must, however, confine ourselves to an extract from Gosse's interesting little book on the birds of Jamaica.