, 1880-09-04
SCIENCE.
The Recent Boston Meeting Of the
American Association.
4 Test OF the iyorkfng os Prof. Bells
Wonderful rlotorllone.
Cfookos' "'adlant Matter Tnhns "--Mauneltt
Survey Of Culture.
Astronomical fJTsto.try-fere,frJ- -Sftn'e-Ttatl.
Ing in tht rnb1tt Schools.

Astronomical tJFstostry-fere,frJ -Stftn'e-Ttatl.
ing in tht rnh1ie Schools.
spte!dt Correspondence of The Chicago Tribune.
HosTuS. Mnss.. AmE. 51.-Yo,tr correspond
eMt l,us beem sayare,1 to-day wit!, MI oppos-
t,iN!ty tn test tho wurk!ng nf
fi10F. TEE1'S WONDERFUL. TtioTopttOSE.
Tile apparatus was vet uu In tila th], story Of
tho Institute Of Technology, tho speaking
transmitted being arranged ou tho root OF
tlie mli0lnIng Museum u( Natural History,
We first tried the Arrangement for tho pro
'ftctton nf sotlntl f'y tight. described IN luy
last letter. THE perforated brass wheel was
set II, rapid hut silent ,notiol., nltt tho light
i'asslng through the l0lcs WIS received
Mt tho focus oil icus on the 0pp,st
Side OF tho room, upotl small RIB
hgr disk. constituting tic diaphragm
of tho hearing apt'aratss. Il clear, lond,
musical s0t1Ml was heard, interrupted NJ
otter Us the i.aitf was placed across tic bea1,,
0f sunlight 1fcre tile rIlythmtcnl Impact nf
the beam Of light on tho rnbbcr disk WIS tlle
sole origin of tho sound. M aerial yibra-
tfons we're used to produce tho sound, and
no electricity was employed In lts TRANSMITS
sion. With tic se}ensnm cell for y receiver,
the sound heard wins mich louder, and was
nlAinly tliscernihlD wlieu sheet Of },artl
rubber WIS held In the patti Of tho light,
thus completely cutting of NIL Visible rntlta-
tioMs TIle mirror-transn,ittcr on the roof Of
tte Natural History building flashed Its
messages across t0 the lnrge parabol1c re-
Hector in tho Institute. III tho focus Of tho
reflector the scleni1m cell was adjusted, and
tho local electric current through 1t In
cltlel two telephones. llncing ono
to each cat, heard distinctly, "Iiow
do you tl0Y How dn you sIo ~ utll
other sl,nrt sentences Of Hike import. When
tlle operator was singing, the time Of tile
t,tne could be l,latlc ont py merely watching
t1le varihtlolss In tho transmitted light. Thus
both tho eye and tho ear were called upon to
nttcst tn tho SUCCESS OF the experiment, and
human speech was flashed through space by
the swift-"lngcd messenger, Light. Can
Science enter any further into the domain Of
tho t.saryelous9
Ut almost tqual interest to tho physicist is
the display oC
c1utoKEs' fsAn1ASr MATTER ru1,Es,"
exhibited D,' Queen l. Co. These tubes are
exhausted 10 mItliuntl Of MI atmosphere,
anil are supposed 10 exhibit tho effects uf
molecular impacts tn What Cr00kcs calls tile
fourth Ur ,ltra-gascons stateof niatter. Ger
n!lil II ls tlat 2 piece Of plnttuam helsl
alumlnunl. constituting the negative poll,
Of the lube, Is heated 10 white heat
gu! Is PASSED through the tube; also, n light
within l,be FROM nne end 10 lilo other. md
hack again when thu current is reversed,
We havu ordered a. full set. Of these Tubes
for importation. and tic Chicugo Electrical
!Society will have the opportunity of seeing
81 So 1nrgo S" 4 III ln,1,nlrr it Of papers ,,as been
presented nj tlls scss1on Of Tic AssocIatOn-
:W III aliItltat cut refer ia ,omiy few Of
u.e ~ 'hoSh lsnnoftalt. M @ iInl. r. =. Niplcr, OF
Oh Oil LOUIS "as oss" engage" LOT '"'S' years
.,, - MAe'SEIio ;ss: SURVEY % OF MISSOURI,
setelllii,c result: Forty-lve stnt!o',s s3r
lagneiic observations Inns been estatlislle!l;
dcc'lnat!pn Of tho, nee!llo laye been
completely refluceti. Tic lines Ut
cillaI lnagnetie vurfatton from, gctt~
graphical Hortl1, present. great 'lrrsgu-
latIol 10 tho dra'.uaso system of tiloso
rrgtons,-tho hee'lle slH'wiIlE Il tendency 10
SIT at r!s!.s angles ~ the valleys anu water
Gnrss: ,niin . Mi,e yloti'ests T.: a!'at tho mag
,Shict. bend around the dry hills anl n!nWnt~
alns, taking by preference tho eonrsu OF the
!" %eSn1wm IL aw The sede aSs IT, se.
rent: mud, II ,eartl-currents exist, l'nylnga
Eenern! tirect!on from east 70 west, the @ls-
normal t!evtations Of ttle ncetlle aro thereby
fully NeeoNMted for. II ls ,prnnoseI to searcl.
lnetfo.t, employed in ,Eurul,a many, years
nsn; Tint @s,. by. long tciegrapil.llnes
IT grounded ut each end ant wltlottt nattcry.
Tint enrtll.ct,rreIts io exit, Is 4 wsll-knnwn
t1Nsl md HtrttlHlti, y