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unde the nam of Lahes These are trul pre- cipitates of the colouring matter, in Combina- tion,ith various mordent a their bases. The colouring of the bones of a liviniani- mal by the use of mander, is in eVer Circum 'ance analogous to the formation of these Iahes. The colouring matter of the madder, passiniunal tered through the digestive organs of the animal, enter the generat massi flu-
df, and is di olved in the serum of the lood; whicli, indeed, is it be in large proportion, communicates a very sensibi re tinge. iut there is always present in the bl ood, and in a state of solution in the serum, a quantity of the earthy matter of the bones phosphate of lime, ready obe deposited as the exigencies of the animal siali require. ow the phosphate of lime is in excellent mordent to adder has a raroniassinit to it an consequently is admi-- radii fitte to assor a base to the colouring alter of t. In sucii Xperiments there re, the concrete in the state of a right red
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ake, henc the colour of the hones is de-
sionis adder, in distilled ater, e added a Iitile of the muriat os lime, no change is per ceived but is to this mixtureae adde a so- lution of the phosphat o soda, immediatet a 'doubie elective attraction ahes place The muriati acid, combining illi the soda, re- 'main suspende or dissolve in the water; ,hile the hosphori acid thus deprived of iis soda combines illi the lime, hici, the muria- ticisci hau parte with, and forins phosphate ras lime or arthis bones This substance be- ing, however insolubie in ater falis to the 'ottom. But havin combined, at the instant is it formation, illi the colouring matter of the adder, the falliown unite into a Crim- son ahe, precis et of the fame in With that is bones, of ounianimais, Whicli have been sed illi madde r.
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Jut it by no means follows, ilia the enamel of the eeth maymo acquire a tinge in the fame anne a the earthis bones, provided that he fluid of the od were sussciently laaded illi the colouring matter os adder,
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other such tingin materiai, ut the time that the enamel issecreted ordirsi assumes a concrete form a injounianimais hile thei ieeth are ust in a nascenti incipient states o perhaps Hill et ter in the foetus in utero, te by miX-
in the tingin materials plentifully with the odis the mollier duringier gestation. ut even though the en amel inould acquire in inge ii suci, trials it may ed be that his i tinge halli ver disserent rom that acquir at the fame time by the bones Foris the structure and composition of the enumel is din ferent Do thos of the fibrous o earthy par of the bones, it is lihely that i may have in disterent esse ' in modisying the colouring matteris adder both illi respectri the particular in or species o colour, and the particula stude or intensiity of it Just as e sind that with the same coloured infusion by employin different mordent or bases Vario us Hahes may be obtestaed.
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est is natural to conclude that thereia heman vegetable substances, hicli, lihe the oot of madder, are possesse of the quality is communicatin a particular Colour to the 'ones of livinianimais, suci a the particular substanc employed ives o otheriodies and , may attain t almost absolute certainu in ciliis matter, by such an experimen a that just
' his purpos perhaps the ciuices o rhind of seme dar purpi fruits may be possessed of sucti' qualities, a severat appea totas through the
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'intestinat canat, illi ut a vin unde inone ae' er great change in respect of thei colour. Ille Enipa Americana may be of this nature, the pul surrounding the laeds of hicli, is uid 'o ain animal alter of an in delibi blue. VΡlurima experimenta de compositione corticis striati feci, eam calori et aliis examinibus subjiciendo, et ex hisce e materie ab ossis veri male rie diveria, nempe ex calcis Carbonate potissimum Constare mili videtur.
Ex his observationibus manis est pulverem implicissimum et optime in natibus frequenter applicatum, riathim deterere, periclitari. Usque ad hoc tempus pulveris solius applicatione dentatim Curatores non contenti ope mellis, C. in glutinum eum formant unde vis ejus agendi multum augetur, dentes muli citius albos reddit, superficiemque Corticis striati politam deterit. Cremor tartari pulverum, pro dentibus abstemgendis venditorum, frequentissime partem Constat. lentium corticein striatum prorsus detri-
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tum vel solutum ejus actione, hominesque inde miseros redditos, novici mamque sensilis tactu levissimo pars ossea fit Et quidem cremor tartari solus adhibitus est, et laudatus a D. I. HUNΤΕR ericulum simplex, quod sequitur, quodque facile iterari potest, ad ejus modum agendi detegendum feci. mentem in cremoris
tartari ex aqua communi solutionem immersi;
post duodecim circiter horas, superficiem corticis striati asperrimam, et crystallis ex propria ejus
materia et acido tartaro, artritide scit calcis, conflatis, omnino obductam helus inveni Cortex
striatus sola pars affecta videtur, quamvis pars ossea nonnullis crystallorum cooperitur. Quomodo hoc sit, perspicuum est acidum enim tartareum magis amne est teri: calcareae quam potasta ideoque corticem striatum, qui illius natura est, ad se rapit, relicta simul potassa ita igitur, formatur artris Calcis, quae in aqua ferme insolubilis, brevi sub forma crystallorum deponitur. Notandum praeterea quod in tartaro acidum tartareum praevalet, ad saturandam potussam. Hinc intel
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ligi potest, quam facile corticem striatum, etiamsi non omnino decomponeretur, solveret. Cum vero pro Cremore tartari acidum ipsum tartarosum substituitur eodem temporis spatio crystalli multo majores formantur. Essentiae et lotiones quoque variae adhibita sunt, quarum multa quaedam acida continent, et quamVis parce forsan, tamen cum assidua sit earum applicatio, quin dentes non solvant et vitient, non potest paucis absolvam, parentes et tutores omnes niti debent, infantes ut dentes quotidie scit mane et vespere aqua simplice abluant et abstergant ope instrumenti Ang. ootbbr B disti Si vero dentes eorum vel gingiVae vitiantur, quam primum arcessendi sunt ii quos penes est dentium Curatio.
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PROPTER delicatam corporis humani structuram, omnibus hi temporibus innumeris fere malis obnoxium cst; sed ob insignem infantiae irritabilitatem tum magis quam ullo alio tempore a causis, etiam levissimis, assci periclitatur. Plurima igitur mala praecipue primis artatis annis invadere solent quo sic tempore dentes, maxillis emergere obserVantur. Hac temporis convenientia seducti medici utrosque inter affectus nexum arctum intercedere opinati sunt atque exinde ad assectiones morbosas, tunc praesertim oriundas, explicandas theoriam concinnaverunt,
quae certe prae aliis majori hominum parti arrisit; nempe has assectiones violentibus conatibus dentis per gingivam erumpentis, vel erupturi, eandemque lacerantis, scribendas esse. Haec opinio per longam annorum seriem ab uno ad alterum
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tradita est cique credunt plerique medici tam antiqui quam hodierni at sine harum partium satis accurata examinatione, quae e sectionibus solummodo acquiri potuit. Nisi limites, qui hujusmodi dissertationibus vulgo praescribuntur, jam pridem transiissem, plurimas observationes ad opinionem eorum stabiliendam per scripta diffusas collegissem in praesentia
tamen pauca tantiim harum opinionum capita percurram, ut, quam sibimet invicem obsint, quamque fallaces inductiones inde deducantur, monstrare possim. Sic dixit H1PPOCRATE ' dentes caninos erupturos vehementirumas affectiones gignere Bo-ΕRHAAVIUS ' autem omnes dentes acutos tales similiter inducturos opinatura sed commentator ejus AN SCIET EN rationem, valde speciosam, facilitatis, qua alii dentes prae aliis erumpunt, re dere conatur, verbis quae sequuntur Cum autem omnia haec mala a tensione punctura, M
' id Aphor. s. sedi. 3. V Aphor. 37 , Comment Vol. XIV. p. 7 6.