Physiological Approach in Study of Ageing 29 



can be found in any kind of animal and that senescence is 

 thus a fundamental characteristic of all living matter. But 

 these various kinds of animals apparently do not age in the 

 same way and some groups constitute, from the physiological 

 point of view, natural experiments on a grand scale, which 

 should be studied more closely. The understanding of the 

 normal ageing processes in man should certainly benefit from 

 such comparative studies. 



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