In bringing this matter before you to-day, I am conscious of two difficulties. The first arises from the fact that only a limited portion of you can be regarded as being especially acquainted with the organ; the second is caused by the comparative certainty that among such organ authonties as are present there must be some who occupy the very first rank. There exist here, therefore, the very strongest reasons both for and against my speaking in a rudimentary or ultra-explanatory way. As a consequence, all I can do is to make these remarks as clear as is possible without their becoming wearisome,—trusting that the experts will excuse my telling them many things which they already know much better than I can myself claim to.