172 



DR. J. D. MACDONALD, I.H.R.N., F.R.S., ON 



of might have a mixture of orange in it, and yellow the 

 sama, or it may be too miicli on the green side, while blue, 

 indigo, and violet with their intermediate semitones or 

 semihues are often so indefinitely alluded to as to preclude 

 that precision which is a sine qua nun in the statement of 

 experimental results. The annexed table is intended to 

 supply a reliable scale and nomenclature of the semitones 

 of colour in relation to the chromatic scale of music. 



N.B. — The numbers to the left of each column indicate the Diatonic 

 Scale of sound and colour respectively. 



Unless some intrinsic defect can be shown to exist in the 

 frequencies of the notes and colours given in the foregoing- 

 table as well as the inapplicability of the undulatory theory 

 to the case, it would be difficult for any opponent to evade 

 the truth of the analogy of sound and colour. On the 

 other hand if these matters are admitted to be intrinsically 

 correct, notwithstanding the temporary opposition which is 

 sure to present itself, the well-founded laws of musical 

 harmony will be applied to painting, the art will be con- 

 verted into a science, and the principles of the analogy will 

 be taught at the Koyal Academy in time to come. 



