TRANSLATOR'S PREFACE.
In presenting his work to the profession, the translator wishes to acknowledge the assistance received during its preparation from his friend Dr. Charles E. Rider, of Rochester, N.Y.
During the work of translation his advice on all doubtful points was freely sought and as freely given. While the book has been passing through the press, he has, at the expense of great labor and care, assisted in the reading and revision of the entire proof.
Rochester, N.Y., Feb. 15, 1878.
3
