in = fl RB. . 
On the Vision of Colours. At 
5. There is not much difference in colour be- 
tween a stick of red sealing wax and grass, by day. 
6. Dark green woollen cloth seems a muddy red, 
much darker than grass, and of a very different 
colour. 
7. The colour of a florid complexion is dusky 
blue. 
8. Coats, gowns, écc. appear to us frequently to 
be badly matched with linings, when others say they 
are not. On the other hand, we should match 
crimsons with claret or mud; pinks with light blues; 
browns with reds; and drabs with greens. 
g: In all points where we differ from other per- 
sons, the difference is much less by candle-light than 
by day-light. 
III. OBSERVATIONS TENDING TO POINT 
OUT THE CAUSE OF OUR ANOMALOUS VI- 
SION. 
The first time I was enabled to form a plausible 
idea of the cause of our vision, was after observing 
that a sky-blue transparent liquid modified the light 
of a candle so as to make it similar to day-light; 
and, of course, restored to pink its proper colour 
by day, namely, light blue. This was an impor- 
tant observation. At the same time that it exhibit- ° 
ed the effect of a transparent coloured medium in 
the modification of colours, it seemed to indicate 
VOL. V. F 
