pic encephalic
anatomy, which, while seemingly imperfect in many respects, has, at
least, the merit of stimulating thought, and has given an impulse to a
reform which will not cease until something has been actually
accomplished in this direction. The object being to substitute for many
of the polynomial terms, technical and vernacular, now in use, technical
names which are brief and consist of a single word. This has already been
adopted by several neurologists, of whom we may mention Spitzka, Ramsey,
Wright, and H.T. Osborn.

Luys holds that the brain, as a whole, changes its position in the
cranial cavity according to different attitudes of the body, the free
spaces on the upper side being occupied by cerebro-spinal fluid, which,
obeying the laws of gravity, is displaced by the heavier brain substance
in different positions of the body.

Luys claims that momentary vertigo, often produced by changing from a
horizontal to a vertical position, seasickness, pain in movement in cases
of meningitis, epileptic attacks at night, etc., may be by this
explained. These views of Luys are accepted as true, but to a less extent
than taught by Luys. The prevalent idea that a lesion of one hemisphere
produces a paralysis upon the opposite side of the body alone is no
longer tenable, for each hemisphere is connected with both sides of the
body by motor tracts, the larger of the motor tracts decussating and the
smaller not decussating in the medulla. Hence a lesion of one hemisphere
produces paralysis upon the opposite side of the body. It has recently
been established that a lesion of one hemisphere in the visual area
produces, not blindness in the opposite eye, as was formerly supposed,
but a certain degree of blindness in both eyes, that in the opposite eye
being greater in extent than that in the eye of the same side. Analogy
would indicate that other sensations follow the same law, hence the
probability is that all the sensations from one side of the body do not
pass to the parietal cortex of the opposite side, but that, while the
majority so pass, a portion go up to the cortex of the same side from
which they come.

Dr. Hammond says that the chief feature of the new Siberian disease
called miryachit is, that the victims are obliged to mimic and execute
movements that they see in others, and which motions they are ordered to
execute.

Dr. Beard, in June, 1880, observed the same condition when traveling
among the Maine hunter