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7 X. - Specimens illustrating the operations of the Department of Chemical and Physical Tests. [[underlined]] Installation. [[/underlined]] In preparing this exhibit, the methods of installation and labeling which prevail in the United States National Museum, were followed in many respects. The paper by the Assistant Secretary in charge of the National Museum entitled, "Museum History and Museums of History" was closely studied, and the principles therein laid down, which the author has thus briefly summarized, were followed, to-wit: "No pains must be spared in the preservations of the mate[[strikethrough]] r [[/strikethrough]]"^[[r]]ial in the exhibition halls. The specimens must be prepared in the "most careful and artistic manner and arranged attractively in well "designed cases and behind the clearest of glass. Each object must "bear a label, giving its name and history so fully that all the "probable questions of the visitor are answered in advance."* [[underlined]] Size of Models. [[/underlined]] In deciding upon the size of the models to be exhibited, the belief that, in a great exposition[[strikethrough]] , [[/strikethrough]] containing many buildings widely separated from each other, the visitor[[strikethrough]] , [[/strikethrough]] especially interested in the gradual development of implements or machinery, desires to examine many objects bearing on the same subject[[strikethrough]] , [[/strikethrough]] in as limited a space as practicable, led to the construction of models generally one-eigth or one-tenth full size. By this means, a person studying the collection, especially in a crowded hall, is able to dis- [[line]] *See page 264 - Papers of the American Historical Association, 1889.