The National tribune., 1888-08-02
SCIENTIFIC CHAT.

Students Of the earth's surface viii be anxious
TO sec the huge globe that Is to be exhibited next
year in the Champs de Mars, in Paris. 10 will rO-
tate properly on an axis, and will be accurately
constructed on q scale of one-milliOnth. Even at
that It Will be tremendous thing, and give con-
siderable Of an idea Of the appearance of the world
we live on.
For the convenience Of housskeepers a sad or
hatiron has been invented which makes use Of the
principle of expansion of metals by heat to ring a
small bell when the iron is hot enough to iron
clothes with. pot that will sound gong when
about to boil over may be expected next.
- BrOwn-Sequard reported, in L Union 8fedicals
q series Of experiments rabbits and birds, in
which lie produced kind Of rabies by injecting oil
OF tansy. This rabies lie able to overcome by
subcutaueOus injections OF chOrRl and surround
ing the subjects with vapors of this drug, and be-
lieves, from analogy, that chiOral administered
would prove to be preventive Of true rabies in
DR. Feltz, In L Art Medical relates the follow
ing as possible explanation Of the occurrence Of
leit-haudedness. In q family composed OF i've
persons, the father and mother were right-handed
also the eldest son. who had been cared for
in his infancy by a nurse. The second child had
been nursed bv the mother and was ieft-handed
The third child also nursed by his mother was at
the age of one year evidently leit-hauded, never
EraspIug any object with his right hand. Dr.
Fetz noticed that the mother carried the child on
her left arm and, upon being questioned, said it
had always been her custom to carry her children
on this The Doctor advised her to hold the
child on her right arm She did so; the child soon
began TO his right hand in seiZiug objects, and
is now at the age of 10 years, normal as regards
I
The Doctor explained that when the nurse carries
the child on her left arm, the left Of the in
fgnt il the one which Is free, and which conse-
quently he learns 10 use to the neglect of the right.
EDITOR NATIoSAL tribune: 1 noticed in re-
cent issue an article entitled The Indians of
Ecuador What / want TO know is this: The
article states that those Indians possess the secret
of the process Of tempering copper TO give it
the edge of fine steel Now, if this can be done by
anyone else. and Elm this country, OF what value
would it be?-O. 3. DAY, New Richmond o.
The art OF temperinG copper so as 70 give 1t a
| hardness and fine cutting edge was known to the
Egyptians Greeks and Romans, but IL is one Of the
| lost arts. Scientific men have yainly endCayOred
to redscover it. It is possible that the Indians Of
| Ecuador have, as stated in the paragraph, acci-
| deutally found out how to do this, but we want
| more conclusive evidence than has yet been fur
nishcd before believe it. II would be of some
value to civilization if the art were redisoovered
but would not have nearly the Importance it once
had, since we have iron and steel now which do the
| work better than the copper tools and weapons
ever did. If it be true that the EcuadoFans know
the secret il will not be long before the world al
large is in possession Of it. for there hosts O
! men who stand ready to make the journey &c
Ecuador if there is the slightest chance Of gaining
| the knowledge.