Intelligence and Miscellaneous Articles. 



471 



and crystalline lens. The choroid is pale, and deprived of pigmentum 

 nigrum • and in the retina Mr. Mackenzie could detect no limbus 

 luteus nor foramen centrale. To the paleness of the choroid, Mr. 

 Mackenzie attributes in part the greenish appearance of the interior 

 of the eye, asserting that in all probability the light, no longer ab- 

 sorbed as in health by the choroid, is reflected forwards again into the 

 eye The most remarkable change, however, is in the lens, which, 

 while it is destitute of anything like that coagulation which attends 

 lenticular cataract, is found to have assumed an amber, and in some 

 instances a reddish-amber or brownish-amber colour, especially in 

 its posterior lamellae. The glaucomatous lens, viewed in Us natural 

 situation, seems of a greenish, sometimes of a deep sea-gTeen, colour 

 Remove it from the eye, the greenness is lost ; and on being viewed 

 against the light, the lens is found of a deep amber colour. Mr. Mac- 

 kenzie supposes that the glaucomatous lens, being of an amber 

 colour and the vitreous humour also yellowish in glaucoma, they 

 probably absorb the violet and blue rays of the light entering the 

 eve leaving the vellow and green rays but little aftected, whence may 

 result the greenish appearance of the humours. He compares this 

 diversity of colour in the glaucomatous lens, according as it is viewed 

 in or out of the eye, bv means of reflected or of transmitted light, to 

 what is observed in certain minerals, such as the crystals of certain 

 salts of palladium and some tourmalins, which are of a deep red co- 

 lour when viewed in the direction of their axis, and of a yellowi.sh- 

 green when viewed in a transverse direction. "The patient with 

 glaucoma sees ill," says Mr. Mackenzie, « partly from the retina being 

 unsound, partly from the choroid being unable to absorb the rays of 

 light partly from the light not being freely transmitted by the central 

 dark-coloured portion of the lens ; but still he sees, and sees for 

 many years after the glaucoma has become observable, a sufficient 

 quantity of light for the perception of objects being transmitted 

 through the circumferential portion of the \m%r— Glasgow Medical 

 Journal, Aug. 1830 ; London Medical Gazette, Oct. 8, 1831. 



LUNAR OCCULTATIONS FOll JUNE. 

 Ocadtations of Planets and fixed Stars by the Moon, in June 

 1832. Computed for Greenwich, by Thomas Henderson, Lsq. ; 

 and circulated by ike Astronomital Society. 



# Thi» occultation doubtful— perhaps «n nppulso only 



