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2dly. Every organized body, on the surface of our globe, is sub- 

 ject to the powerful influence of physical agencies. We remark the 

 same vegetable to vary in many of its most remarkable qualities, 

 according to situation, &c. The tree of luxuriant branches and ma- 

 jestic grandeur, transplanted far from the genial influence of the solar 

 rays, becomes a frail shrub, or even does not elevate itself higher 

 than an herbaceous plant ; and the savoury vegetable soon loses its 

 qualities in a foreign land. If climate exercises such infinite power 

 over vegetable life, to what extent, is it reasonable to suppose, can 

 it influence the higher order of animals, connected as they are, so 

 intimately, by one of their most important functions, with the at- 

 mosphere, in which they exist ? If we cast our eye over the different 

 species of Mammu"-"", we shall soon observe, that its influence on 

 animals is fiiUy as great, as we might, a priori, have been led to 

 suspect, from observing its action on the vegetable world. In fact, 

 we remark the same animal assuming different statures, new forms, 

 various colours, and changing the proportions of its different parts, 

 according to the circumstances, in which it is placed. Even man, 

 who can, more than any other animal, accommodate himself, with- 

 out undergoing very material changes, to all climates, all tempera- 

 tures, the different varieties of atmosphere, and every mode of life, 

 alters his organization to adapt himself to these various circum- 

 stances. He assumes a different stature, another colour of the skin, 

 and undergoes alterations in his moral and intellectual character. 

 The modifications, which the same species exhibits under different 

 circumstances, produce what are called varieties ; and these varie- 

 ties are so remarkable, that we are often at a loss, whether to con- 

 sider them as simple varieties, or as different species. 



3dly. Obvious and remarkable characters distinguish the different 

 sexes. We find peculiarities in each, not only in respect to those 



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