and general distinctions upon the grossest error? But to whatever length criticisms of this kind might be extended, I shall proceed no farther, especially as it does not form my principal object, having already said enough to put every reader on his guard, against the general as well as particular errors which abound so much in the works of nomenclators. [Footnote D: _Homo diurnus sapiens; homo nocturnus trogloditus._] In drawing general conclusions, from what has been advanced, we shall find that man is the only animated being in whose nature there is sufficient strength, genius, and flexibility, to subsist and multiply in all the different climates of the earth. It is evident that no other animal possesses this grand privilege, for, far from being able to multiply in every part of the globe, most of them are confined to certain climates, and even particular districts. In every respect man is the work of heaven, while many animals are the mere creatures of the earth. These of one continent exist not on another, and if there are a few exceptions, they are so changed and diminished as hardly to be known. Can a stronger proof be given that the impression of their form is not unalterable? that their nature, less permanent than that of man, may in time be varied, and even absolutely changed? that from the same cause those species which are least perfect, least active, and furnished with the fewest engines of defence, as well as the most delicate and the most cumbrous, have already, or will disappear, for their very existence depends on the form which man gives to the surface of the earth, or permits it to retain. The prodigious Mammoth, whose enormous bones I have often viewed with astonishment, and which were at least six times bigger than those of the largest elephant, exists no longer; although its remains have been found in Ireland, Siberia, Louisiana, and other places remote from each other. Of all species of quadrupeds this was certainly the largest and strongest, and since it has disappeared, how many smaller, weaker, and less remarkable, must have perished, without having left any evidence of their past existence? How many others have been improved or degraded by the great vicissitude of the earth and waters, by the culture or neglect of nature, by their long continuance in favourable or repugnant climates, that they are no longer the same! and yet, next to man, quadrupeds are beings whose nature is most fixed, and whose form most permanent. Birds and fishes vary more: those of insects are subject to greater variations still; and if we descend to plants, which ought not to be excluded from animated nature, we shall be astonished at the celerity and facility with which they vary and assume new forms.