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[[strikethrough]]great system[[/strikethrough]] of assisting and encouraging collectors which has grown to such remarkable proportions in late years, and which [[strikethrough]]has always[[/strikethrough]] from the outstart has been the the chief source of increment to all departments of the museum. [[strikethrough]]The specimens of mammalia re[[/strikethrough]] During the ten years under consideration fully one hundred expeditions and surveys were undertaken by the Government, and [[strikethrough]]from[[/strikethrough]] by nearly all of these a greater or less number of specimens of mammalia together with other actual objects were collected. The territory covered was in the main that of the western part of the United States. The fauna of the Mexican frontier was abundantly represented in the collection of the U.S. and Mexican Boundary Survey and that of the northern frontier in the collections of the Northern Boundary Commission ^[[[[strikethrough]] and the survey of the Upper Missouri[[/strikethrough]]]] while those of the Pacific coast and the great central region occupied the attention of the