18 
These combinations, simultaneous or successive, are governed 
by certain laws. Some notes sounded together make a concord, 
others a discord ; certain colours also placed together afford 
us pleasure others offend. There are harmonies of colour 
as well.as of sound. Two adjacent notes and two adjacent tints 
in the gamut of colour are discordant, alternate notes and 
alternate colours are concordant. Seeing that these striking 
analogies exist, have we not here a source of pleasure and a 
’ method of expression almost untouched ? Is it not possible that 
rapid combinations of colour may be formed so as to produce to 
the eye somewhat the same effect as music tothe ear? Is it 
beyond the skill of our mechanicians to design an instrument 
whereby the performer shall be able to translate his thoughts 
into harmonies of colour as now he can into harmonies of sound ? 
It seems that either by the aid of sunlight, or by the electric 
light passing through coloured media which may be capable of 
quick transposition, it would be possible to have a piano of 
colour, in which the notes should be light waves, not sound 
waves, and the operator touching the keys should be able to 
produce symphonies which should appeal to the eye rather than 
to the ear. 
WEDNESDAY, JANUARY 13th, 1892. 
MICRO-PHOTOGRAPHY 
(With a Demonstration), 
BY 
MR. D. ‘EH.’ CAUSH. 
Mr. Caush explained the apparatus generally employed for 
taking micro-photographs, and the methods he had himself 
followed with regard to plates, developing, &c. Several success- 
ful photographs were taken by way of illustration. 
