he
well-known question put by Mr. Molyneux to Locke, which was
answered by both these gentlemen in the negative.

"_Fourth Experiment._--In a vessel containing water to about the
depth of one foot was placed a musket-ball, and on the surface
of the water a piece of pasteboard of the same form, size, and
color as the ball. The patient could perceive no difference in
the position of these bodies; he believed both to be upon the
surface of the water. Pointing to the ball, I desired him to
take up this object. He made an attempt to take it from the
plane of the water; but, when he found he could not grasp it
there, he said he had deceived himself, the objects were lying
in the water, upon which I informed him of their real position.
I now desired him to touch the ball which lay in the water with
a small rod. He attempted this several times, but always missed
his aim. He could never touch the object at the first movement
of his hand toward it, but only by feeling about with the rod.
On being questioned with respect to reflected light, he said
that he was always obliged to bear in mind that the
looking-glass was fastened to the wall in order to correct his
idea of the apparent situation of objects behind the glass.

"When the patient first acquired the faculty of sight, all
objects appeared to him so near that he was sometimes afraid of
coming in contact with them, though they were in reality at a
great distance from him. He saw everything much larger than he
had supposed from the idea obtained by his sense of touch.
Moving and especially living objects, such as men, horses, etc.,
appeared to him very large. If he wished to form an estimate of
the distance of objects from his own person or of two objects
from each other without moving from his place, he examined the
objects from different points of view by turning his head to the
right and to the left. Of perspective in pictures he had, of
course, no idea; it appeared to him unnatural that the figure of
a man represented in the front of a picture should be larger
than a house or mountain in the background. All objects appeared
to him perfectly flat. Thus, although he very well knew by his
touch that the nose was prominent and the eyes sunk deeper in
the head, he saw the human face only as a plane. Though he
possessed an exc