We are living in a time when old interpretations and old theories are being re-examined. New evidence has been found that affects many of these, and even if it had not the reweighing of the evidence for them may be of considerable value. In the consideration of the problems of ancient climates the study of new areas of sedimentary rocks and the more intensive study of areas that have long been more or less familiar must disclose many new things and suggest better interpretations.

Some papers recently published in Germany show awakened interest in ancient climates. The old standard works on recent climates by workers in Germany, France, and America are valuable so far as they relate to the various physiographies, assemblages of organisms, and accumulations of sediment that have been formed under the influence of different climates. Studies in sedimentation in particular should help us to interpret ancient . . .

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