1892-93.] Dr William Pole bn Golour-Blindmss, 
103 
Data on the Phenomena of Colour-Blindness, chiefly 
derived from Foreign Sources. Compiled and arranged 
hy Dr William Pole, F.K.S., F.RS.E. 
(Read January 16, 1893.) 
In the course of an investigation into the “Present State of 
Knowledge and Opinion in regard to Colour-blindness,”* it was found 
necessary to search for many data illustrative of various matters 
connected with the phenomena of the defect. These were obtained 
from a great variety of sources, chiefly from foreign publications 
not easily accessible ; and as it was highly desirable to bring them 
forward in evidence, showing their bearing on difficult and con- 
troverted points, the plan has been adopted of collecting in this 
place the most important extracts, and of arranging them in a con- 
venient manner for reference. With this view they have been in 
some cases translated and quoted entire 3 or, in others, a summary 
or abstract has been given of the principal matter they contain, 
distinguishing the various authors under each head by letters of 
reference. 
The following is a classified list of the subjects and authors 
quoted : — 
On Dicliromatism produced hy Disease. 
Letter of 
Letter of 
Reference. 
Reference. 
A. 
Schelske. 
C. Von Kries. 
B. 
Kuel. 
D. Uhthoff. 
On One-Eyed Colour-Blindness. 
E. 
Becker. 
H. Von Kries. 
F. 
Hippel. 
I. Hering 
Gf. 
Holmgren. 
J. Hess. 
On Dicliromatism in 
the Normal Retina. 
K. 
Schelske. 
M. Von Kries. 
L. 
Fick. 
K. Hess. 
* Published in the quarto Transactions of this Society, vol. xxxvii. 
