The 17th edition of Remington's pharmaceutical sciences is organized as its immediate predecessors, adhering to the concept of division into 9 parts, each subdivided into several chapters. Every chapter in the book has been revised, rewritten and updated, and a new chapter on dissolution appears. During revision, all chapters were thoroughly reviewed to eliminate unessential duplication of material and thus recover space sorely needed for new material. A number of halftone photographs have been replaced by schematic drawings or blow-apart drawings which better explain the construction or operation of equipment or apparatus. Practically all the structural formulas depicted in the drug monographs have been replaced with standard USAN structures for uniformity and clarity. All CAS registry numbers and molecular formulas were checked and molecular weights recalculated by computer to insure accuracy to the number of significant figures indicated. The 17th edition contains 100 pages of additional material besides that gained through streamlining several chapters. It is estimated that 200 pages of new material has been incorporated in the book with an actual physical increase of fewer that 100 pages.