104 
Proceedings of Royal Society of Edinlurgh. [sess. 
On Variations in Dichromic Vision. 
0 . 
Cohn. 
E. 
Stilling. 
p. 
Ophthalmological Society. 
S. 
Holmgren. 
Q. 
Bonders. 
T. 
Pole 
On Variations in Normal 
Colour Vision. 
V. 
Lord Eayleigh. 
Y. 
Konig. 
w. 
Von Kries and Frey. 
Z. 
Hering. 
X. 
Bonders. 
Miscellaneous. 
AA. Fick : Explanation of Dichromatism. 
AB. Krenckel : On Theory generally. 
AC. Konig and Dieterici : General Investigations. 
AD. Hillebrand : On Luminosity and Colour. 
AE. Clerk-Maxwell : On the Palliation of Colour-blindness. 
AE. Letters on the Law of Heredity. 
AG. Pole’s Notes on the Appearance of the Spectrum. 
At the end will be found a list of the works and papers from 
which the extracts have been taken, and of others which have been 
consulted for the purpose of the inquiry. 
A. 
Sclielskds Case of Dichromic Vision hy Disease, 1865. 
This case was tested by Maxwell’s revolving discs, giving the 
following equations : — 
33° yellow -i- 327° black = red. 
200° blue 4- 160° yellow = grey. 
150° blue -f 210° yellow = bright green. 
It was found that the patient saw a mixture of much red with a 
little blue, as identical with grey, and also that a certain blue-green 
was not to be distinguished from grey. 
B. 
NueVs Remarks on his Case of Dichromic Vision 
hy Disease, 1878. 
The history of our scotom^e centrale appears to throw a bright 
light on the question. What are the colours really seen by the 
Daltonians ? 
