An introduction to astronomy: designed as a text-book for the use of students in college. By Denison Olmsted ...

iTHiE PL AN1 TS.
the var ying ciercums tances that influence. t le tides, becomes a
matter of suelh intricacy, that L,a Place pronmlees cs tll
problem of the tides" tiet most diflicult probleml of celestial
meellhanies.
2.,Ti.'lihe.Atfmo.b)hlere that envelops the earthll must evidently be subject to the actioll of the saminle forces as the cov —
crinlg of waters, antld hence \e might exptect a i'ise and fall of
the barometer, inldicatingl an at nosphleric tide corrces)ondilg
to tlhe t.ide of the ocean. La. Place ]tas calctulated ttle amounft
of tilts acrial tide. It is too inconsidertable to be detected l)y
chlanges ill tlle barolmeter, unless by tte most reftiled observations. Ilcneo it is conclluded that te tluctuations prodlueed by
this cause are too slighlt to affect mleteorological phllenomena in
any appreciable degrsee.'
0( 1[ A P`TE I.X.
OF1 THl.Ei PL, ANI';S- 1.I...INFEltO. PLANAtfI;'8)tOURY AN1) VENUS.
296.:lm, name plainet significs 1a waader,,t' and is applied to tllis class of bodies because tltey slhift their positions
in the hleavets, whltelas thie fixed stars apparlently alw\ays
maintainl thle same places wit.h respect; to eachl other. T'1e
pllanets 1k-nown fi'oln a hight antiquity', tare Mercurly, l't enus,
igatrtlht, lars:l, J'upiter, and Saturn. Tlo these, in 178, wals addedt
Uranllusl: (or!l. eri~hel, as it was forlmerly called, frot' tle name
of its (liscoverer), anll as late as 18.:t(i, another large )lanet,.Nep)tune, wvas addedl tlhe, list, lmakingt eight in all of tlhose
bodies usually called planets. ]esid(es these,lthere" is, between
Mars and J\upiter, a remarkabll e grout of snall t)lalets, called
A. s1tePoid., or mor1e properly, P.laneloids.'tour of thleni were
discovered near the beginning of the present century. L1oint
*' iBow(itch1's 1A Place, it., p.. -i From t he, lGcl, G avtreek.: rlem'ovll Ovpvos.