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THE CRYSTALLINE LENS.ITHE pellucid water, silualed within the capsule
of the crystalline lens and the lens itself. In QUANTITY, it appears to be scarceb more
It is Sgc RETED by the pellucid remuli of the artery whicli runs to the capsule and lens. The abundant part is carried bach by the absorbing
UsΕ : It prevenis the concretion os me crystabline lens Vith iis capsule.
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gi The CARMICO PHYSIOLOGICA L Doctriste
THE coloured mucus whicli covers the anterior anil posterior sui face of the iris. The colour, of the anterior sui face of the iris is various; but in the posterior sui face whicli is called UvEA it is always blach, and agrees Withthe choroidat pigment. VARIETY OF COLOUR in the iris. In nor heria kingdonas the iris is bluisti, or of a pale asti colour. In Marin regions, it is usualty of a dark chesnut, Ortalmost blach. In donae, the iris has striae of
Various colours; and there are also mera Wholiave a disterent colour in each eye. In animais the colours of the iris are offenvivid. Tellom, in the Wolf, Cat, and O l. Golden, in the P, Q and Fi , and of asDer hae in sonae. The eyes of s me animais, as the Ferret and Zibethus, give out lighb in the night time.
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of the FLUIDS of the HUMAN BODY. 85 SECRETORY ORGAN. The furface of the irisis flocculent like vetuet; and a coloured mucusis secreted in to the flocci, by the arteries of theiris; whicli, When in too great a quantity, appears to be again taken up by the absorbingvesteis. The nigrum pigmentum of the uvea contributes much to the colour of the iris: sorupon removing it the colour of the iris ischanged.
The colour of the iris is also destroyed, is iis socci be contra Red by alcobol of Gine; or thevellieis of the eye dilated by in ammation, or dis solved by putriditP. The CoNsΤ1ΤυENT PRINCIPLEs of this pigmentis animal mucus mixed Uith a peculiar colouri principie.
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THE blach, or brownim blach mucus,' Vhiclicovers the anterior surface of the choroid membrane contiguous to the retina, and the interior sursace of the corpus Ciliare. CONSisTENCE: Anteriorly it is thich, posterior lythin, and is some hat deficient at the entrance of the optic nerve. In the embryo it is veryblach; in infanis it is the thickest and most clam-my: for the older the person the thinner and soster it becOmeS. In the eyes of AEthiopians this mucus is thichand blach. In Leuco AEthiopians, both men and animais, it is entirely Wanting; so that the red
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' of the FLUIDS of the HUMAN BODY. 8ν sanguineous Messeis of the retina and membrana choroidea may be seen through the pupil; as in the eyles of White harps, s me d0gs, and white
The CossTITUENT PRINCIPLEs are, animal
THE TEARS CHE limpid fuid secreted by the lachrymal
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88 The CHEMICO-PHYSIOLOGICAL Doctrine externat canthus of each Orbit, and emits fix orseVen excretor ' duns, Whicli Open on the internalsurface of the upper eyelid above iis tarsus, and pour sortii the learS. The tears have iDixed with them an arierisus roscid Vapour, Whicli exhales frona the internalsursace of the cyelids, and external of the lunica conjunctiva, into the eye. PerhapS the aqueous humour also trans ides through the pores of the cornea on the sursace of the eye. ABSORBENT ORGAN. A certain part of this
aqueous fluid is dissipaled in the air, but thegi eatest pari, after having performed iis ossice, is propelled by the orbicular muscle, whicli sociosely constringes the eyelid to the bali os ille
Frona this collection the lears are absorbed by the ori es of the punctae laci, maliae : frona theracethey are propelled through the lachrymal canais, into the lacla)mal ac, and flow through the dis Ius
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The LACARYMAL SAC, appears to be formedos longitudinal and transverse muscular fibres ;and iis Ibrse ori es fui nisti ed With smali sphindlers, os ille pasmodic constriction of the pundiae lachymaliae proves, is examin ed Willi a probe. SMELI None. TASTE: Sallista, as people
The OVANT 1 TY, in iis natural state, is just suin scient to moliten the sui face of the eye and eyelids; but frona sorro xv, or any hi nil of stimulus applied to the sui face of the eye, si great is thequantity of tears secreled, that the punctae lachryn aliae are una ble to absorb thema Truus theg realest pari runs down frona the internat angle of the cyelids, in the sorm of great and copiolas di OpS, upon the Cheekq. A great quantity also
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The CHEMICO PHYSIOLOGICAL Doctrine descends, through the lachrymal passages into the nostriis; hence those Who Cry have an increased discliarge frona the nosse. Tears exposed to the ATMOSPHERE, OT OVAporaled by a gentie heat, dry into a luteal malis, Whicli osten exhibiis Cubic crystalS.I 1ΜΕ WΑΤΕR is not rendered turbid by tears, be cause the soda they contain is not aeraten butcaustic and thus theo .iolets 1s rendered
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A peculiar mucus, coagulated by alcohol of
Culinardi fait, causis and pho borared foda: alsophosphoraled calx is obtained frona the incineraled
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92 The CHEMICO PHYSIOLOGICAL Doctrine
3. They wassi and clean aWay the diis of the latinos phere, Or any thing acrid that has fallen into the cye, by the true Cis medicalix. 4. C, ing unloads the head of congestions.