Lewiston teller. [volume] (Lewiston, North Idaho) 1878-1900, 1883-06-07
scuHr1F1c MISCELLANY.

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concludes that the various stones used ior {
building will retain decent appearance
in walls for the following periods: Coarse
brovnstone, from five to fifteen years,
lsminsted fine brownstone, from twenty
I've to fifty years, Nova Scotia stone
probably from fifty to 100 years; Ono
sandstone, 100 years: Caen stone, from
IS 70 40 ycar,, coarse dolouite marble
40 years; fine marble sixty yea:r'; pure
o,los.eous marble, from 80 to 90 years;
granite, according to variety, from 20 to
400 years. Among the chief dostroyer-
II the stones are solvent substances wash
q from the air BY rains, and the heat
Of the sun.
The injurious results which have fol
lowed the removal Of forests in the French
Alps have been described ty Mons. ?.
De.ostsey. These effects have been
chiefly the washing Of great quantities
q detritus down from the slopes the rapid
fovma&ion Of gullies and ravines, and The
i.uadasion Of good valley land with sand
a.d gravel. To remedy further growth
q the gullies it is proposed to build num-
ssuus small dams to intercept the sodi-
uent that is being carried down by the
streams, and to stop the wearing away
Of the bare hillsides trees are to be plant
I'd = rapidly as possible.
On the basis of the capillary rhenom-
sss, De Heen has calculated that cube
Of water whose sides measure one twenty
9Th of an inch contains about twenty
Ave trillisAs Of molecules.
DR.. j. r. Pollock considers that the
evidence furnished by the Brompton
Hospital, London-which has had by far
the most extensive experience with the
disease Of any institute in the world
proves that consumption is not conveyed
from ono person to another by contact OF
BY breathing the same air. At least
during the 36 years the hospital has been
IN operation, the medical attendants, nurs
= and others employed about the estab
lishment, have been unusually free from
this affection.
Prof. TAFT lately announced to the
Royal Society Of Edinburgh that he had
succeeded in obtaining specimen of pure
iridium, and that by means of this ant
pure Tuthenium he expected to succeed
y making 4 standard thermo-eeotri
couple. Such an apparatus would giv'
VIA. he had long sought--a definite
standard for comparing very high temper
atures, such az those OF furnaces, etc, TO
which no suitable instruments exist a
present
Dr.. John Hopkinson, +. r. s., state
that electric lighting in London must nov
eost rather more than lighting by gas
In regard to future increase in the econ
ony Of the former, it may be said tina
no material change can be expected il
engines, boilers or dynamo-machines ma
be somewhat lcssoned. Great improve
mont is however, possible in incandescont
lamps. With these great economy Of
power can be had by driving them a
high pressure, but then the lamps 500
break down; and the problem is to so in
prove the lamps in detail that they wi
last for considerable time when presse
70 their highest efficiency BY realizin
such improvements DR.. Hopkinson BE-
ksves it would be possible to get fiv
times - much light for sovereign as ca
be done now.
A series Of photographs ilustrativ
Of some experiments made by Prof. Vo
ziemssen formed curious exhibit at tn
Munich Electrical Exhibition. Thes
pictures showed human face bearin
tAs expressions Of joy, pain, surpris'
Doubt disgust, etc, the various chang,
having been each excited in turn b
bringing current Of electricity to az
spoa the different facial nerves Of tn
person photographed. Under the electr
influence each set of nerves produced il
ewa peculiar contortions of the count,
aance.
Montreal, which so handsomely eute
tanned the American Association for IL
Advancement of Science last summer
70 receive visit from the British ASS
siation in 1884, and no less than "a
members Of the latter body have alread
signifcd their intention Of attending Il
Canada meeting
From discussion of the sunshine re-
ords made in Great Britain during ii
years 1881 and 1882, Mr.. w. W. Ru,
dell, F. NJ. S., makes it appear that til