Reactions to On the Origin of Species man to be envious of a naturalist like myself, immeasurably his inferior!" Darwin's had estimated that erosion of the Weald would take 300 million years, but in the second edition of "On the Origin of Species" published on 7 January 1860 he accepted that it would be safer to allow 150 million to 200 million years. Geologists knew the earth was ancient, but had felt unable to put realistic figures on the duration of past geological changes. Darwin's book provided a new impetus to quantifying geological time. His most prominent critic, John Phillips, had investigated how temperatures increased with depth
On the Tendency of Species to form Varieties; and on the Perpetuation of Varieties and Species by Natural Means of Selection of science on which they bear". Years later, Darwin could only recall one review; Professor Haughton of Dublin claimed that "all that was new in them was false, and what was true was old." Despite illness, Darwin pressed on with writing the "abstract" of his "big book" on "Natural Selection"; this condensed version was published in November 1859 as "On the Origin of Species". In a largely overlooked passage from Wallace's essay, he says of the evolutionary principle: The action of this principle is exactly like that of the centrifugal governor of the steam engine, which checks and corrects any