iv
PREFACE.
culus, however, have not been employed, since, in most institutions in this country, the study of Physics is commenced before the student is sufficiently familiar with them.
The authors desire to acknowledge their obligations to Wm. F. Magie, Assistant Professor of Physics in the College of New Jersey, who has prepared a large portion of the manuscript and has aided in the final revision of all of it, as well as in reading the proofsheets.
W. A. Anthony,
C. F. Brackett.
September, 1887.
