New-York tribune. [volume] (New York [N.Y.]) 1866-1924, 1884-09-14
that such experiments M had been made on sche-
halicn and Arthur's Seat had led to results satiH-
factorily near To those of Reich and Baily.

that anch experiments M had been made on sche-
haIlien and Arthurs Seat had led to results salts
factory near to those of Reich and Baily.
CURIOUS CONDITIONS ~ CAL1FoRNiA.
So much had seemed 90 me suggested
by Airy's work in the llarton mine. and
] had expressed nm opinion to that effect IN
dealing with the subject Astronomy In Tho
Encyclopedia britannia" aud In RodwclTe
CyclopodR Of the Physical NcionccH'
WIS specially interested therefore when
I learned from Professor Davidson, whore
position M one of the most ekilful Astronomers
aud pcodctlsa LIVING is we'll known. that In CALI
fornia the indications of subtcrrnncan structure
was entirely inconsistent with the principles ON
which the Schchallicn and llarton experiments
were conducted. Not only was the plumb line not
detected to use that convenient mode of express
sion toward the mountain ranges, hut the CON
trary was ia many cases noticed, rs though tho
deeper valleys and even inlets of The sea were &C.
gions of compression and therefore Il greater
density while the mountains were honey
combed or partly hollow beneath Their
outer crust and were thus regions
of greatly diminished density. II we consider
how very Irregular the structure Of the carths crust
must he in a region manilcstng such pccularitics
we shall see how important is the light thrown 10y
Professor Davidsous observations on the geology OF
California. On the mountain slopes, close by what
had been regarded as an immense ridge OF rocky
masses capable of cNcrtmg an apprcciohc-nay,
even a markod-pull on the plummct, an effect was
observed AKIN 10 an appreciate thrust from the
mountain range. In the neighborhood of vast areas
of depression. suggestive of an absence of the
usual quantity of matter aud therefore OF dnnin-
ishcd attraction the pun was found 10 be increased
toward those AREAS Ii follows that there must be
"A most abnormal density beneath the regions OF
dcrrcss0n the most abnormal liGhtucss only 10 Ice
accounted for one would imagine by vast cavities
in the structure OF the mountain range. Nay
it would seem 10 follow That not onlF
IN the mountain rance itself bat drep
down into tine carthS crust hcneath the mountain
range. this lighnCss of structure must extend.
such state of things necessarily implies lnsta-
bilitv We cannot wonder tnat IN California great
earthQuakcs are Of frequent occurrence. Bul ono
circumstance communicated 10 me 10y Professor
Davidson who will trust. before long punliNh lh
full the details of ms most Interesting ohserNa-
tions seems surprising even when the HN@uIUIl
of structure in California Is fully taken into ac-
count He found IN certain places evidence oil
what appeared tO be a change IN tnc position OF
observing stations. after the lapse of but few
we're astronomical and. therefore, of course af.
fccted ~ any abnornality IN the direction OF
gravity. me stations, had not actually
changed their place but the arrangement
far altered that the Astronomical obserFutlou~ APP
pearcd to Indicate change of position by several
hundreds of yards. Nothing OF tgl- AlhI hd- ever
10 the best of my knowledge am belief. nten ODE
.crvpd eIe,, here. In the Russian plains NJ. OF "
strive had observed singular deviation, pm ne dl-
rcrfiou of gravity where uniformity had been
looked for lut Professor a'lG,ou upS'rF1i .ous
are the lI-t iu which EVIDENCE has been "nt Inrd
of change beneath the carths cruS TBS nlch o."
dr,,uon off gray nv 700 one ard ~" same pace h'7
changed within short .r!ods0' time
Iti- worthy uf note fhlt 20 ucU field q OBSERVE
tiou nal, even new method "t 70 tai'.' ',a
the number of observers no regions lhr 'aNioIuii.
and IN extending Inquiry over other parts ul llr
pariL' crust Science MAY fu 300 observation. of thD
I... Haze. ffff tfi. tIff d q