INDEX. 



page 

 Mtcromeler^ description of one with a single lens, - ii9 



Mines^ coal, on the means of procuring a steady light in them 



without the danger of explosion, - - 200 

 explosions in, a few of the most considerable in 



the neighbourhood of Durham recorded, - - 201 



N 



JVarwhale, on the tusks of that animal, - - 126 



JVgar siz^htedness usually commences between the ages of ten 



and eighteen, - - - - 31 



■ ajBTects the higher classes of society more than 



the lower, - - - - - ib, 



sometimes occasioned by an evident change 



in the spherical figure of the cornea, - - 34 



— — — seldom alike in the two eyes, - - 35 



has no dependence on the greater or smaller 



degree of convexity possessed by the cornea, - - 41 



not necessarily occasioned by a morbid pro- 



trusion of the whole eye, - « - ii^ 



O 



Observations of some principal fixed stars, results of them, 285 



13 Uisae Minoris, - - . i^^ 



13 Cephei, ... 286 



« Ursae Major. - - - ib, 



— ^ X C^ephei, - - - ib^ 



a Cassiop. *- » - - 287 



y Ursae Major. - - - jb. 



. — y Draconis, - « - . 288 



— ■ » Ursae Major. - - - 289 



« Persei, - - - ib, 



Capella, - - - ggo 



« Cygni, - - - - 291 



a Lyrae, - - • ib, 



— Castor, - - - 292 



— Pollux, - - - ib, 



13 Tauri, - - • - ib, 



a. Cor. Bor. - • - 293 



a Arietis, - - - - if,^ 



Arcturus, - - - 294 



Aldebaran, - - - /^, 



p Leonis, - - , 295 



MDCCCXIII. T t 



