In sending forth the tenth edition of this work, I can do no less than thank my readers for this evidence of the esteem in which they continue to hold it. To render this edition still more worthy, I have added accounts more or less full of the newer remedies, have inserted a special article, though succinct, on prescription writing, and have made changes at various points to correct errors that have been overlooked, and to supply omissions of necessary matter. To accomplish these objects with as little increase of space as possible, I have stricken out references at various places. These are the less to be deplored as medical libraries are becoming more numerous and readily accessible, and this kind of information is sufficiently conveyed to the intelligent reader by the mention of the names of the more important contributors.

In the prefaces to the eighth and ninth editions respectively, my views regarding the admission to the work of the rapidly increasing new remedies have been sufficiently given. As the next decennial revision of the United States Pharmacopoeia is near at hand (1900), we may look for some authoritative action then, whereby the present state of uncertainty may be finally terminated.

Roberts Bartholow, M. D.

1627 Locust Street, Philadelphia, July, 1899.