294 CLASS MAMMALIA. 



whole extent of a very large tree, assume every possible 

 attitude, pass from one position apparently the most diffi- 

 cult that can be, to another still more difficult, by the most 

 rapid and extraordinary motions, without experiencing the 

 slightest obstacle or impediment from the multiplicity and 

 complication of the branches. Accordingly they have 

 but few enemies which can openly overtake and reach 

 them. In old age they become thick, clumsy, and inac- 

 tive. They constantly sit upon their callous posteriors. 



The principal nutriment of these animals consists in fruits, 

 roots, the tender leaves of trees, and the young sprouts of 

 certain plants. When they eat, they always commence by 

 filling their pouches, and they drink by suction, like all 

 animals with long and mobile lips. 



The countries which they inhabit are not yet known to a 

 degree of precision, the greatest number appear to be in 

 Africa, but India likewise possesses them. Hot climates 

 are indispensable to their nature. In winter, they could 

 find no means of subsistence in northern regions, nor are 

 they provided by nature with a covering to resist the cold ; 

 accordingly, it is only by keeping them very warm, that we 

 can preserve them in menageries. 



We know little or nothing relative to the reproduction 

 of these animals. Their development is slow. It is only 

 towards the eighth or ninth year that they become entirely 

 adult, and it is probable that their life is prolonged to 

 thirty or forty years. The females are smaller and gentler 

 than the males. 



It is unnecessary to enter into any minute account of 

 their organization. It would be but tiring the reader with 

 vain repetitions. Of the points of interest relating to them 

 as a subdivision enough may, perhaps, have been said. To 

 extend the essay much would necessarily involve points re- 

 volting in the discussion and terminating in no adequate 

 beneficial result. 



