444 
CAPTAIN ABNEY AND MAJOR-GENERAL BESTING 
IPs observations. 
Origina 
readings. 
Beduced readings. 
Scale reading. 
Intensity. 
Scale reading. 
Intensit}-. 
54-32 
11-0 
43-6 
0 
53-63 
19-0 
44-0 
1-5 
51-47 
40-0 
44-5 
6-0 
51-12 
43-5 
45-0 
12-0 
50-77 
69-0 
45-5 
20-0 
50-60 
92-0 
45-9 
27-0 
50-42 
119-0 
46-1 
33-0 
50-24 
137-0 
46-3 
45"0 
50-05 
160-0 
46-4 
60-0 
49-88 
190-0 
46-5 
64-0 
49-70 
226-0 
46-8 
70-0 
49-70 
277-0 
47-0 
735 
49-52 
309-0 
47-5 
81-0 
49-16 
346-0 
48-0 
84-0 
48-64 
390-0 
48-5 
80-0 
47-75 
417-0 
49-0 
72-5 
47-38 
390-0 
49-2 
69-0 
46-85 
346-0 
49"6 
54-0 
46-50 
309-0 
50-0 
35-0 
46 50 
277-0 
50-5 
19-0 
46-33 
226-0 
51-0 
11-0 
46-33 
190-0 
51-5 
7-8 
46-15 
160-0 
52 0 
5‘5 
45-61 
137-0 
53-0 
3-5 
4515 
1190 
54-0 
2-25 
45-15 
92-0 
55'0 
1-5 
45-07 
69-0 
44-72 
43-5 
44-53 
40-0 
44-35 
19-0 
44 0 
11-0 
§ XVII. Summary of Observations on Colour-blindness. 
We have now described in some detail the results obtained from the observations of 
four persons who are more or less colour-blind. It may be assumed that H and R 
are totally blind to the red, and the curve of their red deficiency is therefore of more 
than passing interest, more especially as they so nearly agree in characteristics. An 
examination of their curves leads us to suspect that the colour entirely wanting in 
their colour perception is a red which lies about 436 on our scale, and would appear 
to us of a crimson hue. The fact that the red and blue deficiency curves meet at E 
is also instructive. In G we have an example of partial colour-blindness to red, his 
curve showing that he is not entireiv insensitive to red radiation, but that the 
perception of it is damped in some peculiar manner. We may mention that some 
near relatives of his have the same peculiarity of vision. 
Dr. Pole’s curve is a most puzzling one, and, as we have already said, it might 
