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when they die.  It has been found impracticable to do so with rare or specially valuable specimens, because in the vivarium they easily loose their identity, while, on the other hand, it often happens that their death is only discovered after putrefaction has set in rendering them unfit for preservation in alcohol.

During the present year Professor E.D. Cope has finished his work on the [[strikethrough]] collections of this [[/strikethrough]] North American Batrachians based upon the collections of this department, and has commenced a similar study of the North American snakes in the museum.

Dr. G. Baur, of Yale collecte, New