374 Scientific Proceedings, Royal Dublin Society. 



Index to Fig. 2. 



To understand these symbols it will be necessary to call to 

 mind the changes which chords can be made to undergo by 

 introducing sharps or flats, and we must provide suitable symbols 

 to represent them. These, for our purpose, should be as suggestive 

 as possible. 



A major chord may undergo the following changes : — It will 



