This banner text can have markup.
"Spencer's Formula of Evolution" is an article from The Philosophical Review, Volume 19.
View more articles from The Philosophical Review.View this article on JSTOR.View this article's JSTOR metadata.
You may also retrieve all of this items metadata in JSON at the following URL: https://archive.org/metadata/jstor-2177431
For print-disabled users
on March 14, 2013