New-York tribune. [volume] (New York [N.Y.]) 1866-1924, 1871-10-05
SCIENTIFIC NOTES.

rro DrTrfT SvIPuUR IN COAL GAS'-CIcA
,,i.l.,l a si.aly process of detecting the presence
of sulphur in ordinary illuminating gas i"o sam
,bc =, IS used IN a BGscn burner TO neat ''"n f'
uun dish containing water. After eVap'rS'ilS "'o"'
nm, oc wafer the outside OF the vessel VIII nc lou" "
I've parity coated with an oily mud when can .nnhnIic
N shawn hy ordinary qualitative tests 10 ~ ii,s,o
chi Tue same author states that the Whc NJ ;n
In which sometimes makes its appearance ON ,,o
IL f i,mn chmney> consists Of suphae oI ali'uo"'
D,NpoxITr.-A new substance has rcceh'iy
,ocr discovered by Amf Urard In the inda r"p"ei VI
The Gaboon. when treated with mixture Vi S''pn"..
and nitric acid the rubber is transformer in'o 10y!
thick and translucent substance WHICH, .nio""
water urccipitateS in the form OF hakes' lno i''t
rot. whom carefully washed and dissolve IN ooHE q"
oi dcnosits CRYSTALS of nitrated damh"nlte' Will
;nsolu6e in alcohol and dctonatcs under Ie bHdTodc
The new raSe, damhoni;c treated VIII r Lu'''e ~
acid Yields dambOSc. which acts similarly
Tur GLACIAL ErOCH OF GEOLOGICAL re-
o,, ,ooctipg NJ the London Geological Society Lieut.
Col Drayson, r. A.. read paper "on the DH",
Causc Date and Duration Of the Glacial EpOch Oh "o
oev in which the author starts from the faSt t my
c Of the ccrc could not he the center OF Pod me ne
Ian as The pole vlrc dtance from tnat center .hi
'cS,CG ' scG S ~ +, give for the date 1900 B. C. eli
mate Nc @ in XniGr ana ' Of the D glacial epoch he
fixed at about 1900 years Inc calculations resulting
this assumed movement were stteu I" agree aCSu
fatcly with observation
FIroRrsCENr Solutions. - Henry Morton
President Of stevens Institute, Hoboken has made
series Of experiments, from which he draws the curious
conclusion that all familiar fuorcscent solutions, such as
The ncture Of tuneIc of agaTic, of ChlOrophy and the
,nt,on Of nitrate of uranium emit light of the same
color 10y GuorCccCc. namely blue Identical with that
developed by acid salts Of qu'ninc THIS pue however
as vel known r." Of quinnc Is not Oi single
tnt or giity, but yields continuous spectrum
which Tie Trir3nsihlc rays predominant Ihus
IL seems that the molecules Of nuOrcsccnt bodies in
solution not capable Of restricting their vibrations
i"lm''i rIng'S, though dnc same substances III 'ne
sohd SKATE may act quite differently
No., De- r. Y
IREs>loN-Mr T. {. Mcndenhall of Columbus, Ohio hal
given in The American Journal Of Science aud Arts ar
Of experiments made by him to determine Inc
time required to communicate impressions to the sen
RGrum and to receive response TO such impressions
His pap OF proceeding does differ essentially from
that first used by American astronomers In determining
what technically called the personal equation Time
measured by means of ordinary register, similar u
the astronomical chrOnOgraph in which strip OF paper
moved with regularity at the rate OF about one
inch and half per second the seconds being REGISTERED
upon this slip 10y Of seconds pendulum in tho
electric method The person on whom the experiment.
male Ia seated AZ table, having his hand on key by
pressing which with his finger the circuit Is Completed
hInd ~ nII,cr An apparatus l. attached by means OF
whch the circuit completed for an instant al the mo
r tnT. Of an Pc in dametera card red or white
Which completely fills the opening. The subject is in
hy pressing for a moment the key Immediately on seeing
the card. The actual appearance OF the card ana me
In,uL the circuit are registered upon the
band Of paper by two dots separated by an interval p
pruXmaing perhaps 10 Onc-ffth Of an inch. BY care
iuy measuring this interval and comparing II with the
registered second expression s obtained for the tne
occupied by somewhat complex operate OF his per
Feivng the object and acting in response 10 that pScp
lion MANY devices used for varying the conditions
uf the experiment with each subject. With different
versions as many 1000 individual trials were made
nrd the OF experiment eliminated aS far as posi-
hlr hy the method OF Below Is table on the
rcdnc results in In which each number Is the
mean OF the results cs G f nT rory 10 lime in seconds
Response to appearance of white card 0292
Rcsposc to app rance of electric spark ..... 4OS
ia souId lS8
I.snou.c iu n ouch ON the ............ lO7
Kr.,,e Ia a touch on the hand ................. Iii
Rrsionsc when deciding between white and red 449
deciding bet ween circle and triangle 49A
Response when deciding between tones and f. -. SSt
when deciding between tones and above 40
The moot remar kahe fact shown by Mr.. Mendenhall
experiments is that perception is quicker through Tho
ear than through the eye