The scheme endeavours to prove that the development of harmonies of sound and of colours is regulated by the law of Evolution as gained from the Scriptures
—Youthful impressions regarding my great-uncle Dr. Darwin's views
—My cousin Charles Darwin's views touched upon
—The scheme involves the belief that life developing from the Almighty is the general
key to disentangle the intricacies of the Natural Sciences
—A remark of Sir John Lubbock's quoted
—The development of Numbers, the stream of Time, the Sevens of Creation, &c.,
may eventually be proved to proceed by the same laws, . . . . . . . 9

General remarks on harmonies of tones and colours
—The scheme gained without technical knowledge
—Brief explanation of how the laws were gained
—The development of numbers showed the "to and fro" in the development of sounds
—Multequivalency of harmonies veering round, or advancing and retiring in musical clef
—Before judging, close examination requested, . 12

General remarks on the method of harmonies developing on all kinds of instruments, including the human voice
—Much paradox, but yet the scheme will admit of clear demonstration
—A musical note compared to a machine, the motive power not of our creation
—The imperfection of keyed instruments, from some notes acting two parts, attuned to the ideal of harmony within us
—Macfarren quoted on the echoing power of a cathedral attuning the Amen
—Why music as an art precedes painting
—Philosophers and mathematicians have only studied music to a certain point
—Every key-note a nucleus, including the past, the present, and the future; no finality in any ultimate
—The late Sir John Herschel's views on the musical gamut alluded to
—The imperfection of keyed instruments adapts them to our present powers
—The laws will be seen to develope the twelve major and the twelve minor keys in unbroken sequence and in harmonious ratio; to gain them in geometric order [as] keyed instrument should be circular, the seven octaves interlacing in tones a lower and a higher series, . 15

On colours developing by the same laws as musical harmonies
—The physical properties of light and darkness briefly considered
—If the laws are correctly gained, harmonics of tones and of colours will agree
—Quotation from a lecture by Professor W. F. Barrett on the order of sonorous and luminous wave-lengths
—Fountain of musical harmonics, E root of B; in colours yellow and ultra-violet, being tints and shades of white and black
—All harmonics of sound and colour condense into a primo springing from the fountain
—Multequivalency of tones and colours
—Wünsch's views nearly one hundred years ago
—Clerk Maxwell's, Lord Rayleigh's, and