On harmonical parallel between tone and colour
—On the term of "rest," fifths, and the sympathy of music with life
—Relativities of sounds and vibrations of strings
—The doctrines of three pairs, six tones, and the law of "two and fro"
—The germ of the system probably to be found in the adaptability of numbers
—Sudden death of Dr. Gauntlett, . . . . . 48 [Harmonies of Tones and Colours, Table of Contents4 - Harmonies]
1867.—"Your plan of eliciting facts from Scripture (altogether new) interests me exceedingly." "To make out the scheme of harmonical parallel proper for the elucidation of your system, it will, if possible, run all true with the harmony of colour, and this has never yet been done, except in a way which has been met with serious objections. When I commenced the examination of your theory, I spent five days at the British Museum, and collated about forty volumes." "I am very glad to hear you have a probability of harmonising numbers by the same laws as light and sound." "What you call rest, I call the appearance and disappearance of a harmonical cycle." "Your series of fifths is quite correct." [Harmonies of Tones and Colours, Extracts from Dr. Gauntlett's Letters1, page 48]