Correction

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 Eb (Q.) is too near D; and the Eb (Y) should be above, instead of below it.