IN planning a work of this character, which requires the expression of a great deal of personal opinion, it is evident, at the outset, that the author renders himself a target for considerable criticism, from those organists who happen to entertain different opinions on any branch of the subject. I am not unmindful of the fact that the success of the work would perhaps be assured, if it were possible to pronounce opinions with which every organist would agree. From the nature of the subject itself, and from a great diversity of personal tastes, any one can see that such a course is absolutely impossible.