tive, to draw in the rudest way the commonest
appearance which depends upon the laws of that science; as for instance, to
represent the effect of two walls standing at right angles to each other,
or the appearance of the houses on each side of a street, as seen by a
person looking down the street from one extremity. Now in all cases, unless
the person has happened to observe in pictures how it is that artists
produce these effects, he will be utterly unable to make the smallest
approximation to it. Yet why? For he has actually seen the effect every day
of his life. The reason is--that he allows his understanding to overrule
his eyes. His understanding, which includes no intuitive knowledge of the
laws of vision, can furnish him with no reason why a line which is known
and can be proved to be a horizontal line, should not _appear_ a horizontal
line; a line that made any angle with the perpendicular less than a right
angle, would seem to him to indicate that his houses were all tumbling down
together. Accordingly he makes the line of his houses a horizontal line,
and fails of course to produce the effect demanded. Here then is one
instance out of many, in which not only the understanding is allowed to
overrule the eyes, but where the understanding is positively allowed to
obliterate the eyes as it were, for not only does the man believe the
evidence of his understanding in opposition to that of his eyes, but,
(what is monstrous!) the idiot is not aware that his eyes ever gave such
evidence. He does not know that he has seen (and therefore _quoad_ his
consciousness has _not_ seen) that which he _has_ seen every day of his
life. But to return from this digression, my understanding could furnish no
reason why the knocking at the gate in Macbeth should produce any effect,
direct or reflected. In fact, my understanding said positively that it
could _not_ produce any effect. But I knew better; I felt that it did; and
I waited and clung to the problem until further knowledge should enable me
to solve it. At length, in 1812, Mr. Williams made his _debut_ on the stage
of Ratcliffe Highway, and executed those unparalleled murders which have
procured for him such a brilliant and undying reputation. On which murders,
by the way, I must observe, that in one respect they have had an ill
effect, by making the connoisseur in murder very fastidious in his taste,
and dissatisfied by anything that has been since done in that line. All
other mu