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for the reading and discussion of the sixty odd papers that were presented. Under the auspices of the Naturalists, Professor Henry Fairfield Osborn gave an interesting illustrated lecture in the lecture hall of the famous old Academy of Natural Sciences, his subject being 'Recent Discoveries of Extinct Animals in the Rocky Mountain Region, and their Bearings on Present Problems of Evolution.' 'The Mutation Theory of Organic Evolution' was discussed in a series of specially prepared papers by representatives of the most advanced research in their respective fields; plant breeding being represented by Dr. D. T. MacDougal, animal breeding by Professor W. E. Castle, cytology by Professor E. G. Conklin, paleontology by Professor W. B. Scott, anatomy by Professor Thomas Dwight, taxonomy by Professor Liberty H. Bailey and ethology by Dr. W. M. Wheeler. This was one of the best discussions that has been held before the Naturalists, as generally interesting as it was timely. It illustrates the value and need of comparison and coordination of the results of investigation in different fields for the solution of problems common to all. If methods are becoming more and more specialized with the growth of exactitude in the sciences,