In the manufacture of any pharmaceutical preparation, two conditions are essential to its perfection, viz: purity and strength of the materials, and appropriate machinery. The first is insured, by purchasing the materials in large quantities, whereby the exercise of greater care in selecting the ingredients can be afforded; and the second can only be accomplished where the business is extensive enough to warrant a large outlay of capital in procuring proper chemical apparatus. These facts apply with especial force to the manufacture of our medicines, their quality having been vastly improved since the demand has become so great as to require their manufacture in very large quantities. Some persons, while admitting that our medicines are good pharmaceutical compounds, object to them on the ground that they are too often used with insufficient judgment. We propose to obviate that difficulty by enlightening the people as to the structure and functions of their bodies, the causes, character, and symptoms of disease, and by indicating the proper and judicious employment of our medicines, together with such auxiliary treatment as may be necessary. Such is one of the designs of this volume. PROPERTIES OF MEDICINE. It is generally conceded that the action of a remedy upon the human system depends upon properties peculiar to it. The effects produced suggest the naming of these qualities, which have been scientifically classified. We shall name the diseases from their characteristic symptoms, and then, without commenting upon all the properties of a remedy, recommend its employment. Our reference to the qualities of any remedy, when we do make a particular allusion to them, we shall endeavor to make as easy and familiar as possible. DOSE. All persons are not equally susceptible to the influence of medicines. As a rule, women require smaller doses than men, and children less than women. Infants are very susceptible to the effects of anodynes, even out of all relative proportion to other kinds of medicines. The circumstances and conditions of the system increase or diminish the effects of medicine, so that an aperient at one time may act as a cathartic at another, and a dose that will simply prove to be an anodyne when the patient is suffering great pain will act as a narcotic when he is not. This explains why the same dose often affects individuals differently. The following table is given to indicate the size of the dose, and is graduated to the age. YEARS DOSE 21. . . . . . . . . .full 15. . . . . . . . . . 2-3 12. . . . . . . . . . 1-2 8 . . . . . . . . . . 1-3 6 . . . . . . . . . . 1-4 4 . . . . . . . . . . 1-6 2 . . . . . . . . . . 1-8 1 . . . . . . . . . . 1-12 ½ . . . . . . 1-20 to 1-30 The doses mentioned in the following pages are those for adults, except when otherwise specified.