With the exception of a few minor details the work of Sir John Stainer remains the same. The new material in Parts I and II comprises the development of the Pneumatic and Electric Actions, with drawings from Key to Pallet, and, as far as possible, the latest inventions have been described. In Part III little has been done except the grouping of 4-foot and 2-foot stops under the correct heading of Foundation stops, and, where stops are known by two different names, the old and the new terms are given for completeness. A list of stops for the Solo and Echo or Celestial Organs, with the character of tone of each stop, together with a complete list of Couplers to be found on Modern Organs, have been added. The section Hints on Organ Accompaniment for the church service is not intended to be a complete guide to this important subject, but to serve merely as an introduction to a fascinating and almost endless study.