INSTINCT AND INTELLIGENCE. 



temperature, but anticipate this change by an interval more or 

 less considerable ; nor do they, as might be supposed probable, 

 suffer themselves to be driven by degrees, from place to place, by 

 the gradually increasing inclemency of the season. It would 

 appear that they consider such a frequent change of habitation 

 incompatible with their well-being, and instead of a succession of 

 short voyages, they make at once a long one, which takes them 

 into a climate from which they will not have occasion to remove 

 until the arrival of the opposite season. 



35. The monkeys, which abound in such vast numbers in the 

 forests of South America, present an example of irregular migration. 

 "When they have devastated a district, they are seen in numerous 

 bands bounding from branch to branch, in quest of another 

 locality more abundant in the fruits which nourish them ; and 

 after the lapse of another interval, they are again seen in motion, 

 the mothers carrying the young upon their backs and in their 

 arms, and the whole troop giving itself up to the most noisy 

 demonstrations of joy. 



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