If possible, reference should be made to the writer. Caution must be used in concluding that a fancied error or omission is real. 'Common-sense' is frequently appealed to, but this indefinable judge cannot be called into operation unless the 'sense of the community' on the point in question has been obtained. Too many people confound their own individual opinion with the dictates of 'common-sense.' For instance, some dispensers invariably add acid to a mixture containing quinine, although solution of the alkaloid is not prescribed. Now, many physicians prefer administering quinine in suspension, and it is decidedly less disagreeable taken in this manner, especially when large doses are exhibited. Moreover, when quinine is given to a woman nursing it is usual on the part of the prescriber to avoid an acid, as it checks the secretion of milk.