TY  - JOUR
T1  - Observations and Experiments on Vision
JF  - Philosophical Transactions of the Royal Society of London (1776-1886)
VL  - 101
SP  - 378
EP  - 391
PY  - 1811/01/01/
UR  - http://dx.doi.org/10.1098/rstl.1811.0021
M3  - doi:10.1098/rstl.1811.0021
AU  - Wells, W.
ER  -