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THE POPULAR SCIENCE MONTHLY. 



M. Chevreul gives us, like that of an old oak overshadowing generation 

 after generation of younger trees. 



A partial conception of the length of M. Chevreul's still useful ac- 

 tivity, and of the extent of his contributions to human welfare, may 

 be gained by recollecting that, his first important work having been 



published in 1806, he has been engaged for more than eighty years in 

 fruitful investigations. As early as 1825, or sixty-one years ago, he 

 was spoken of in "The Lancet " (May 28th) as "one of the most able 

 chemists of the present day in France." He was then pursuing his 



