"I CANNOT CONSIDER ANY FACTS BEARING ON THE INHERITANCE OF MENTAL PECULIARITIES IN ANIMALS AS TRIFLING… THANK YOU FOR COMMUNICATING TO ME YOUR EXPERIENCE IN REGARD TO CATS"
DARWIN, Charles. On the Origin of Species. WITH: Autograph letter signed by Darwin. London, 1860.
Second edition, second issue, as always (the first issue known in only a few copies), of "certainly the most important biological book ever written" (Freeman), published less than two months after the first edition. Together with an autograph letter signed by Darwin to the owner of the present volume, Laurence de Gruchy, thanking him for supplying information on heredity in cats, in which Darwin writes, "I cannot consider any facts bearing on the inheritance of mental peculiarities in animals as trifling, and I thank you for communicating to me your experience in regard to Cats." $38,000.