397 
of the "Production of Colours. 
repeated them several times under different circumstances, and 
I have no doubt that the dispersion of coloured light in the 
human eye is nearly such as I have stated it. How it happens 
to be no greater, I cannot at present undertake to explain. 
CORRECTION OF A FORMER PAPER, 
In the Philosophical Transactions for 1800, 
P. 146, line 12, for 83810, read 84197; 
line 15, for ,0011562, read .0010116, 
In Fig. 53, (Plate VII.) the E b (Q^) is too near D ; 
and the E b (Y) should be above, instead of below it. 
3 F 
MDCCCII. 
