ON THE ACTION OF MEDICINES IN THE SYSTEM; LANE PIBRARY "ON THE MODE IN WHICH THERAPEUTIC AGENTS INTRODUCED EFFECTS ON THE ANIMAL ECONOMY." Being the Prize Essay to which the Medical Society of London awarded the BY FREDERICK WILLIAM HEADLAND, M.B., B.A., F.L.S., JOHN CHURCHILL, NEW BURLINGTON STREET. FANNIN AND CO., DUBLIN. MDCCCLV. The Author reserves to himself the right of translating this Work. JOHN EDWARD TAYLOR, PRINTER, 4300 443 1855 ΤΟ THE PRESIDENT, OFFICERS, AND FELLOWS OF THE MEDICAL SOCIETY OF LONDON, This Essay IS RESPECTFULLY INSCRIBED, BY THEIR VERY OBLIGED FRIEND AND SERVANT, THE AUTHOR. PREFACE TO THE SECOND EDITION. THE first edition of this Essay having been for some time out of print, the Author has been encouraged to hope that a second issue may meet with a favourable reception. He has been at some pains to make such additions to the present volume as seemed to be necessitated by the rapid advance of therapeutic science, at the same time that he has felt the necessity of not increasing its bulk to an inconvenient extent. The first and second chapters have been left unaltered, but some new articles will be found scattered through the third and fourth chapters, and some additional observations and experiments recorded in the same. The Author has derived much instruction from a perusal of the various reviews of his Essay, in English and American periodicals. He is especially indebted to Dr. Maclagan, of |