filT' INDEX. 



Colour, observations on the changes of, in heavenly bodies', 



X. 20-25 

 — vegetable, on the change of, as an alkaline property, 



xiii. 315 

 curious change of, in the oxides of cobalt and zinc, xix. 



342. Nature of, in mineral productions, 343 

 Colouring matter, new, notice of, vi. 56 1 

 Columbite, locality of, xviii. 40S 

 Column (ancient) at Alexandria, observations on the inscription 



on, X. 1-7. Fac-simile of the inscription, 8 

 Combustion, influence of solar light upon, xx. 387 

 Comet of 1811, remarks on, iii. 412 



(new), notice of, v. 117. vi. 348« viii. 51 



• supposed transit of one, v, lis 



on the easiest and most convenient mode of calculating 



the orbit of, from observation, ix. 149-162. x. 416-42G. 



xi. 177-182. xiii. 336-385 

 on the comet of 1819, by Prof. Olbers, ix. 163; by Prof. 



Brinkley, 164-167; and at the Royal Observatory at Green- 

 wich, 381. Notices of new comets, 171. Elliptic elements 

 of Pons* comet of 1819, 382 



of 1822, places of, computed, x. 413 



on the transit of the comet of 1819 over the sun, xi. 182 



on determining the equations of, xii. 137. Correction 



of the elements of an orbit of, that has been determined, 



149 

 — seen at Val Paraiso, remarks on, xiv. 165. Elements of 



one, 411 

 triennial re*discoveiy of, xv. 132. Notice of a new 



one, 168 



catalogue of the orbits of, which have hitherto been com- 



puted, xvi. 149-154, 349-356. xvii. 85-96. Remarks on 

 the periodical (86 01b.), 96-99. Elements of that of 1S23-4, 

 by various computers, 104 



phenomena of, xviii. 165 



of Encke, catalogue of the stars in, xix. 119 



