_Based on the Doctrine of Evolution, with Criticisms on the
Positive Philosophy. In two volumes, 8vo, $6.00._
You must allow me to thank you for the very great interest with which I
have at last slowly read the whole of your work.... I never in my life
read so lucid an expositor (and therefore thinker) as you are; and I
think that I understand nearly the whole, though perhaps less clearly
about cosmic theism and causation than other parts.--CHARLES DARWIN.
This work of Mr. Fiske's may be not unfairly designated the most
important contribution yet made by America to philosophical
literature.--_The Academy_ (London).