"Messrs. Carey & Hart,
"Gentlemen,—I am glad to learn that you have published an American edition of Dr. Gregory's 'Mathematics for Practical Men.' I have for some time been acquainted with this work, and I esteem it highly. It contains the best digest, within my knowledge, of such scientific facts and principles, involved in the subjects of which it treats, as are susceptible of direct practical application. While it avoids such details of investigation and processes of mathematical reasoning as would render it unintelligible to the general reader, it equally avoids the sacrifice of precision in its statement of scientific results, which is too often made in popular treatises upon the Mathematics and Natural Philosophy. The author has succeeded to a remarkable degree in collecting such truths as will be found generally useful, and in presenting them, in an available form, to the practical mechanic. To such, the work cannot be too strongly recommended; and to the student, too, it will often be found highly useful as a book of reference.
"With much respect,
"Your obedient servant,
"ALBERT B. DOD,
"Professor of Mathematics in the College of New Jersey.
"Princeton, Nov. 11, 1834."
Extract of a Letter from Edward H. Courtenay, Professor of Mathematics in the University of Pennsylvania.
"The design of the author—that of furnishing a valuable collection of rules and theorems for the use of such as are unable, from the want of time and previous preparation, to investigate mathematical principles—appears to have been very successfully attained in the present volume. The information which it affords in various branches of the pure and mixed Mathematics embraces a great variety of subjects, is arranged conveniently, and is in general conveyed in accurate and concise terms. To THE ENGINEER, THE ARCHITECT, THE MECHANIC—indeed to all for whom results are chiefly necessary—the work will doubtless form a very valuable acquisition."
Letter from Charles Davies, Professor of Mathematics in the Military Academy, West Point.
"Military Academy, West Point, May 14th, 1835.