The New York herald., 1878-03-05
THE LECTURE SEASON..

PROF EssoR @, r. CHANDLER ON PHOTOGRAPHY.
An interesting and instructive lecture on pho
Biography was delivered last light before largo and
ence IN the hall OF the Young Mems Christian Asso
cation, by Professor G. +. Chandler. Tho dscov-
cry of tho art, It's gradual development
and It's present advanced condition were
dwet upon much length and illustrated
by the use OF magic lantern, tho obscura,
the electric light and hundreds OF photographs
ranging In size from the diminutivc tintype TO
the large Photographic engraving. The lecturer
went through process OF producing, in
the presence OF the audience, number Of
pictures, employing for illustration a lew Of
bra nches oil the suject explained ana illustrated by
the Professor -Dsguerre0typ talbotypes, ambro.
print aberty pes heotypes, photogravure woodbury.
types photo-electricity photo-incographps, photo
engraving and photo-itposraphs. Ihe crude results
OF tne early labors oi Daguerro were c0ntrasted
with the superlatlvely improved pictures now pro-
duced by the most advanced photographers and til o
difference was scarcely credible The dlcrent prop
erties OF the various chemicals ana the particular
manner in which they act In producing pictures were
also explained. Among the pictures exhibited were
several recent imporiations IRON France and Ger
many. The lecture occupied over two hours
PROFESSOR BEvAN ON THERMo-MoToR FORCE.
At Science Hall last evening Professor John Aylwln o
Bevap, NJ d., leclured on the discovery OF thermo-
motor orce tho secret spring. he assured his hearers,
that w1elds the power oil llle anu ueatn. lie en-
deavored to explain the discovery OF thermo- mo tor
force by a familiar comparison. Paper money was
the equivalent Of several combined forces or powers,
ana yet valuelcss unless there correspond
ing specie the bank SO also was the health of the
body and yet In too apparent prosperity Was equally
ncttious unless there corresponding thermo-
motor force Ia the brain to preserve H. There
fore, specie, not paper is the measure of
soIyency so the reserve Of thormo-motor force,
and not apparent heaitn the measure OF that power
OF resistance to opposing conditions aud processes
IN which real enduring health consists. The mon y
force spenders may be divided INTO three classes
that exceed, those that live up 10 ana those that
live below their income. With equal truth
the people VINO regard the expenditure OF
the thermo- motor may be similarly classified.
sumo use 1t excessively and they continually sick
youth. Otbcrs use IL freely by what Is termed
generous living, ana though alwas ON the verge OF
sickness maintain apparent far health. Others
ngiln use II economlcai!y 0y as plain and
simple properly prepared cereal irut and
vegetable diet and an open air lie, ana these
IN times OF excessive exeron, hardship and pestenee
maintain their wOned health andiiv 10 an advanced
age. Tnermo-motor force Resides IN the meduitd OBJ
iongotd ana being essential 10 the digestive process
wieIds the power OF lie and death, Tor upon
It's integrity depends the preparation OF
those fluids which perform threeioid OIL
ice, for they are the nourishcrs OF the body,
dcleuGlng II from tho destructive action OF Inc
oxygen and dif1using through II animal heat. Those
VINO econozo tins iorce by simple diet oil properly
prepared cereals, fruits and vegetables, or outdoor
lie avoIdaDce OF stimuants enjoy length oi hfe.
freedom from disease ana ccarness OF intellect to
which the flesh meat eater, self inGulacrs, VINO take
as their motto, "Dum Vtpinus Vipamus," arc
STRANGERS.