Omaha daily bee., 1897-02-28

the brain and asserts that the one-sidea-
ness of muscular activity is caused prl-
| marily by the dominant influence Oh one
| side of the brain in relation TO uhe uiscnaiso
! of nerve force to the opposite SIZE VI the
! body. 1t would seem, however, tnat tns
| order of causality should be reversed, aIu
| that the one-sidedness Of the pra,n shoulu
be regarded as the effect ana me- 'ne causo
of one-sided muscular activly, anu ms 10
in harmony with the current biolosiSal uoc,
trine as to the evolution of the brain ana
nervous system.
wilson claimed that a right-handed mans
left brain ought to weigh more thah 'hs
right and vice versa ms Is boan fo,nd
yerifcation, as no anatomist mas peeh lounu
who is so skillful that his knife, cutlins
down through the basal gangiia, can uISta1
the brain into two exact haiVes' sepai"'eu
by a perfect median line.
ness of the brain is due to the arrangement
of the arteries, causing a more uirecl Supply
of blood from the heart TO the leit sue y
the brain, thus rendering IL the seal U ~
perior vital force, and thence follows, III con.
sequence, the preferential use Vi 'he iisH'
THE REAL CAUSE. p
A cause for right-handedness may be sug-
gested in the fact that all voluntary eHort,
however slight, is associated with Increased
strain upon the organs of respiration and the
yig,era generally, as Is shown IN pyschoios-
zeal laboratories in all experiments OF IN
nervation and inhibition of movement you
will find that purely mechanical causes uo
so much in altering the lines along when
the growth and evolution of organic Forms
proceed that it is only necessary to take
into account a very minute prepohueIahc
of weight or force in the putting torth OF
muscular effort as a cause for the prelereh-
tial activity of one side of the BODY. An
exceedingly slight displacement OF the center
Of gravity from the median line, when De,
gins after the second month OF ioetal
,n - ~ -rttpf liant IN nrnnnnn II
) number of c%oncomitant variations IN the anat
omy and functions of the Viseeral organs
. and espacially to the right II ng hardly no'lce
able, but still just enough to account iol
! the detection of the main current oil inteiil
j gent, difficult specialized muscular acllvlt!
I to the hand and arm of one side rather thar
= the other,
Z A concomitant is not necessarily
e cause. but 1t is more likely that the caus'
of right-handedness is to be found In Varla
{ tions i'm the yiscera than in the brain. Ate
: the second month of foetal life the apex o
: the embryonic heart Is crowded to the lei
by the liver. The right lung mas thre
I lobes, the left only two. Prof. Baiuwlh =
G Princeton in Mental Development report
e that In his experiments his child used elthe
: hand to grasp a coveted object wheh SO CLOS
e that no ~exertion was needed In reachlhs ~
3 IL. but as soon as II was removed severe
I inches and muscular enort accompanied =
d rapid breathing followed, then me rlsh
st hand only was extended. You notice 1t wa
n moi until the more laboriOus e~xertion brougn
i the lungs into play, and the one-sldedhes
l. OF the viscera became operative that III
r child showed any preference for either hanS
e With this vlsceral-mechanical cause !
S, view you can also account for the asyn
metry of the Two sides OF the Draln' an
le one-sldedness OF the yiscera, slight as
It is, may be suficient to cause SO to 9S pc
sr cent Of mankind to be ,right-handed' an
their being right-handed makes inc
left-handed through the pyramidal az
cussation OF the nerves connectlr
D. the right side of the body with the left ha
" OF the brain. The chief difference petwee
ie the cerebral hemispheres lies In the Ia
ne that the developed centers for speech ar
m writing are located on the side OF the BRA
e. opposite TO and. therefore, connected WI
I'D the preferred side OF the body. There 4"
be portions in the motor-areas of both sides
he the brain capable OF being developed INTO ~
T. centers for speech and TWO eenters ior WI
on ing. although only one OF each Kind Is iul
of developed in the whole brain. Apbasia, y
of loss OF speech. when 1t occurs In q rlsh