In science, as in our business and personal affairs, it is profitable from time to time to look over the ground and see how much we have accomplished in recent years. The present occasion would seem to be a suitable one in which to render an account of recent progress in that branch of paleontology with which I am principally acquainted. It is not a catalogue of recent publications, nor a summary of their contents that is presented in this address, but rather a report of progress, with some suggestions as to where this progress seems to be leading us.

The foundations of paleontology, the documents on which our researches are based, consist of the collections of fossils, which are our record of the past history of life. The breadth and solidity of those foundations must determine both the size and the permanence of the structure that we may . . .

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