S22 Professor Airy an a peculiar Defect in the Eye. 



pointers and greyhounds belonging to the commanding-officer, 

 and tied to a tree, were, on the retreit of the dog-keeper, stung 

 to death. From the cocoon of the Bombyx paphia cloths call- 

 ed Soosee and Mushru are manufactured. 'J' he lac insects 

 abound in the jungles, and the lac produced is one of the 

 principal articles of traffic among the natives. 



Lead and antimony are reported to exist in different parts 

 of Rfimghur, and iron is found in every part of the district. 

 A few miles east of Hazareebagh are beds of very fine mica, 

 from which large transparent laminae are procured. Surab- 

 hulpore has from time immemorial been distinguished for the 

 production of the finest diamonds. They are found in the 

 bed of the Mahanuddee, and at the mouths of its tributary 

 streams. 



Art. XXII — .On a peculiar Defect in the Eye, and a mode 

 of connecting it.* By G. B. Airy, Esq. A.M. and Lucasian 

 Professor of Mathematics in the University of Cambridge. 

 With observations by the Editor. 



Iwo or three years since I discovered that in reading I did 

 not usually employ my left eye, and that in looking carefully 

 at any near object, it was totally useless ; in fact, the image 

 formed in that eye was not perceived except my attention was 

 particularly directed to it. Supposing this to be entirely ow- 

 ing to habit, and that it might be corrected by using the left 

 eye as much as possible, I endeavoured to read with the right 

 eye closed or shaded, but found that I could not distinguish a 

 letter, at least in small print, at whatever distance from my eye 

 the characters were placed. No farther remark suggested it- 

 self at that time, but a considerable time afterwards I observ- 

 ed that the image formed by a bright point (as a distant lamp 

 or a star) in my left eye was not circular, as it is in the eye 

 which has no other defect than that of being near sighted, but 

 elliptical, the major axis making an angle of about 35° with the 

 vertical, and its higher extremity being inclined to the right. 

 Upon putting on concave spectacles, by the assistance of 



* From the Tramaciiuus of the Cavibridge rhilosophiccU Society/, vol. ii. 

 part ii. p. 267—273. Read Feb. 21, 1825. 



