This fact, so far as it goes, seems to make against the theory of transmitted sentiments.] [Footnote 67: Locke answered that the man would not distinguish the cube from the sphere, until he had identified by actual touch the source of his former tactual impression with the object making a given visual impression.

Condillac, while making just objections to the terms in which Molyneux propounded the question, answered it different from Locke.

Diderot expresses his own opinion thus: "I think that when the eyes of the born-blind are opened for the first time to the light, he will perceive nothing at all; that some time will be necessary for his eye to make experiments for itself; but that it will make these experiments itself, and in its own way, and without the help of touch." This is in harmony with the modern doctrine, that there is an inherited aptitude of structure (in the eye, for instance), but that experience is an essential condition to the development and perfecting of this aptitude.] [Footnote 68: A very intelligent English translation of the _Letter on the Blind_ was published in 1773.

For some reason or other, Diderot is described on the title-page as Physician to His most Christian Majesty.] [Footnote 69: _Oeuv_., i.

308.] [Footnote 70: Pp.