Leading evolutionary biologist (1904-2005) credited with developing the modern philosophy of biology. ALS, one page both sides, 5.5 x 8.5, Harvard University Museum of Comparative Zoology letterhead, December 5, 1995. Handwritten letter on his achievements in science, in part: "I was awarded the Medal of Science both for my researches and for my activities in various committees and boards in Washington (Nat. Sci. Foundation, National Research Council, etc.) My researches were in Systematics (classification of animals) and in Evolutionary Biology, particularly the origin of organic diversity (speciation, etc.) Since receiving the Nat. Med. Sci. I have also received two international prizes…I have published 20 books and over 600 journal papers." In fine condition.
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