About 30 years ago there was much talk that geologists ought to observe and not to theorize; and I well remember someone saying that at ... » Go

No one can feel more sensible than I do of the necessity of hereafter publishing in detail all the facts, with references, on which my ... » Go

In considering the Origin of Species, it is quite conceivable that a naturalist, reflecting on the mutual affinities of organic beings, on their embryological relations, their geographical ... » Go

The number of intermediate varieties, which have formerly existed on the earth, (must) be truly enormous. Why then is not every geological formation and every ... » Go

If it could be demonstrated that any complex organ existed which could not possibly have been formed by numerous successive slight modifications, my theory would ... » Go