73

1908 Nov 7
Logic
19

particular way among many in which my idea might be realized. Suppose,
then, that the cones alone gave the sensation of color, the rods along those
of visual place. I will suppose, quite in harmony with chemical theory,
that in the cones there either are three different chemical substances, or
else three different ways in which the same substance can be decomposed,
and that in each case there is a tendency toward recomposition which is
proportional to the extent of the decomposition