have as püre cryftals oP the- tabular kind ; We have Quadrangular
columns* arid triangular pyramids« as püré, tó all ^p'petfrShce,1 as
any öf-the' hexagohaTkind whatsoever the caufe -therefore èftthè'
héxkgöftaMgnrfe muft-be’ fo'meWltefrdiftinCt frond'paid cryftal, fiïite
We fold that pure cryftal can- fubfift Withbtit it, and-is found j g
tfinfparent,-1 hard,- khd immoveable 'to gcidst: in Other «figures * as in
that. It muft be alfó/diftina from the caufe"’of other figüreé’; for
the fame principle Which forms" bbdfes intirian hexagonal mafs,
cannot be that-which in other places ’give the trigonal of rhomboidal
fhape’ to bodies of like fubftanèé.1- It istróe^ityfrals arë öftener
found hexagonal than in any other‘figtire; but this can prove onl^ j
that the caufe o f this figure is more abundant 'than that whiehóó-!
cafions the other figures f i t will notptove, that it is Separable'
from pure cryftal. Salt is the moft Haaive 'pfrnciple è f the foffit
kingdom, every where difperfed, ever buiy* Whéli fluid'and_ ats
berty, in producing multangular figures, according to the feveral
powers with whichnature has invefted-particularfalts " |jj Sand it muft
be obferVëd, that t h ^ ris har#y any figure: ilk the cryMlih^clafe’
but may be found in the analyfis of fome fait'of other. " TRtts,’ for
inftance, in nitre (a felt difperfed in earth and ftone,-in afr-fei’d!
water, in plant and animal,) we find the exaCf reprefeiitktions • o f
hexagonal cryftals in their different ftates fn o w with*öÖé^p^faihid4
apex,-as Plate XIII. Fig. r i now with two,''as'Fig. xi . ' ibmjetintes'
with equal correfporident fides, as Fig. x. fetiièti^ës ^th'dnèqtial,;
as Fig. vin . “ fomè cut doping at the ends down kc-fftferp.edge-,-
in the manner of a chiftel,” ;*fiB. ^ f '62) as Fig;lxix^ bnt' alWays-
hexangular. In fa l gemnue^ and fca-felt, we'find‘the quadrangular
pyramid, with the truncated - ea<fej:-' Id
the cryftals of alum we have the polygon,' F ig i^ x f iV’fS'Well as in
the felts of lavendar and thiftle, (ib. page ifrclf 'Among the cryftals
o f diftilled verdigreafe, (N°. v 1 1 . ib. Plate II. 'page q6) - we -have
the columnar rhomboidal fhootj Fig. XVlf f* Ih,fiie«ifel‘ts;öf tin
(page 128, ib.) we have the two pyramids applied bafë to bale, as
Fig. x iv . In Cheltenham felts (ib. page 154, Plate V.)' We have
the exaft afterifk, as Fig. x x ix . The felt of Camomel has FlgvXx.
(ib. page 166), and the parallel lifts óf Fig. xxx. may be feen
there and in the felts of fennel, (page i^d),’ and in fhé felt df
thiftle, (page ib. 180.) The felt of the Jefuit’s bark is full of
rhomboides. In the fa l gemma (letter 2, ib. pa. 74)^8 that lunip of
pyramidal cunoeids placed laterally as in the cryftal, Fig. x xx v.
The pentagonal tabulated cryftal is found alfo in the felts of camo-
I This has made fome Naturalifts advance that | page 224«
omnis oyöallizatio eft a jfale. <6 Salia. ciyftalli- * See employment For the mic/oltope, by Heiuy
aationis omnis unica caufa.” Linnaeus Syft. Nat. Baker, Efq; F. R. S. vol. II. page 65.
mel,
iG>F :.r! IG-IO R N WA t iA Ï t f \ :X:Zf
mqlj litt«ipage 166.) -vTshe z ig za g angulk- fiHets,of)Kgi vkt.-iare
fourncriiu-Ohekenhara'ïfelts-, .(pagdii^iifi,)- * In,.the felt .of fcitfa-
mony we finértltei eomck'fpir.esi oftFig.:; xx v n ' l . and ft In '.general it
may-^hpiaftirmedb'tihatjthere is feapce,a fignre^arhong the, cryftals but
mayyfee: ï^adeeftamong, the.ïfalts analyzed ;.rhejre therefore>I would
-dbferyb, .that «all theiafluemce whicfemetakihavp ‘upon/ the fhape.df '
“öï^ftakijiis prds«bi^>©wh% »to riicifelts ofejthofe -metals it-.js:.-
obfeivkble in, the felts:procured from ïtin ('as.exhibited;-by ^..-Baker,
lb. Plate IV'. page-. kpxS.)., that they-are -fexaéfelf tof the- femeapolygomal
fhape Ms the real ftbny&ryftalspmclpdiiig this'inetalwhichin Cornwall
We . ealLTin-gfains| ' Againkvlbet ifcnot pafs-nhmoted, .that
ikyftals ia.' ffei«^j^)èdmeimo|a^:4fi-, thé vindicktiöns. neeeffary to
ftiew that they were protruded, fometimes from one oonimaininters
ttaediate Bhè^as Sig. v. vkbfometintósïfrotprsa'lpbirtt/fd^e «aySrfeom
F ig & x x i t i .
Imftatirig ethe laltssf iivvtóeli ifb®Ot;aiidjextend
aÉ.eir>M^s vifrblytill iikeimanrtóf . a n d h e r e w e i p r i i o f s
of ^hetfeme p*ocalure b£ figiteöi bodies from ’aniimfiguiredjih^rand
bf ‘the ife®e«€guf^f»oduc^ feyfthat- proc^ bit ifeep^ibal rpafbnaH-
ble^ tèoseshokidei^^ laotWithfeandfrig; the otgeélions- óf; fpiiioiinoderns,
that th^figfrresi(lfi.cryfi3lS'a*e ;owingi tói tha adventitnoms felslis which
pfirevail in the eryftalline matter.’ :
I p^ ta yfia lsr éfpetüally it&fe^of the- hèxagoóy. kindf are frequently • s e e f .pd.
found i n «cfetftep withc-oae end fixed in <a bed iof- coarfer -cffiftal - than The pointing
the fhbots, and that bed*broke off from a larger; mafs iaftftill coarfer
matèliak, I went not many years fince intor- a rninc * -mi pnrpnf> iiiiaa
obferve thefe cryftal productions in their naturaliftte.* ,':
; ^ïhe.seayity to which we were introduced, .was not much larger than,
a ^common baker’s oven, and much o f that figure, about fivfercétdiigh
from the floor. The roof was the molt-’ lurprizing piece of fretwork
imaginable, v confifting o f . hexagonal cavftals.pointing fbftix irir
every direction very , plentifully 1 ó f fevèial uzès, fömetimes projecting
in groupes and clufters from large protuberances in the cieling,
ftroètimes fii^|le,' ‘ each others .ritiw 'feddMg^ ny each
othet with paralléf .fideé^' the fineft ’were thofë/which had ïönumér
fable little diamonds or fparks of the cleareft’Wdtef belprinkléd upo’fiv
their fides: I oblèrved that their pointing Was 'dfually according and
nearly ,perpendicular to the planekfróm which thëy prbdeédèd; from
which I cönólude, that as the plane, the ftiape^ and truTti o f the
generated In a chalk}" porous ftone, in fhape like
'a,, drpp-ftone;” ij,b.ut: if .this was their original,
fuoh bodies could opjy point to the eenter « the
earth, as ali ■ A y ' grftïiution of
thetr part3 j but the revexfe is true. • '
lapidific
u See Plate XX. of the figured-tins.
u^yPiHion-ibth, in the parifli of St. . Jxift.
'* In Norwayitocagonal- cryftals,' are called
fountain. Drops, and known front ‘experience
(fays Bifhop Pontoppidan, page Eng, to be