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to render premature the exclusive introduction of the metric system. The second volume of this work, including Heat, Electricity, a list of books of reference, and other matters of general interest to the physicist, will be issued at as early a date as possible.

It is difficult to give credit for all the aid rendered in preparing this work, as the author has for years made it a practice to collect for it information from all available sources. He is much indebted to Mr. Alvan Clark for the method of testing telescope lenses, and to Prof. F. E. Stimpson for advice and aid on photometry and other matters. The course in photography is essentially that given by Mr. Whipple to the students at the Institute. His especial thanks are due to his friend Prof. Cross, whose careful examination of the proof sheets, and whose excellent judgment has been of great assistance. Finally, if this volume, notwithstanding its shortcomings, aids in any way those engaged in physical investigations, either the student in the laboratory or the amateur experimenter, the object of the author will have been accomplished.

April 29th, 1873.

E. C. P.

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