This is a signed first edition of Dubos' Pullitzer prize winning book "So Human an Animal". It is inscribed "To Edelvira D. Hendee, in memory of pleasant old days = Rene Dubos New York, December, 1969"
Edelvira D. Hendee is a published microbiologist as well, papers of hers are found online dating from 1947 and 1949
This volume is in great condition, with wear to the dustjacket, but not terribly so. The interior pages are excellent, and it is rare enough to find a first edition of So Human an Animal, to have it signed and dedicated to another scientist is a wonderful find.