INDEX. 



147 



Oil lamps, improvement in, xi. 381. 



— question, observations on the chemical evidence given in the, 

 xi. 86, 327 



— from the seeds of the croton tiglium^ experiments and re- 

 marks on, xiii. 69. Process for purifying fish-oil, 423. Oil 

 for watchwork, 221. Soap, a substitute for, in setting cutting 

 instruments, 221. Of turpentine rendered palatable, 441. On 

 the volatile oil of bitter almonds as a poison, 404 



— experiments on, xv. 155 



— new process for extracting elaine from, xvi. 109 



— of laurel, nature and properties of, xviii. 47. On the oil of 

 mace, 317 



— of wine, production and nature of, xix. 96. Properties of the 

 Margosa, 172. New compounds of carbon and hydrogen, ob- 

 tained during the decomposition of, by heat, 273 



Olbers (Dr.) on the easiest and most convenient method of cal- 

 culating the orbit of a comet from observations, ix. 149. On 

 the comet of 1819, 163 



on the elliptic elements of Pons's comet of 1819, ix. 



382. x. 416. xi. 177. On the transit of the comet of 1819 

 over the sun, 182 



■ essay on comets, translated, xii. 137. On some equations 



of the first and second order which have been proposed for de- 

 termining the equations of, 137. Correction of the elements of 

 an orbit which has been determined, 149. xiii. 336 

 ■ catalogue of all the comets whose orbits have hitherto 



been computed, xvi. 149, 349. xvii. 85 



continuation of the catalogue of comets, xx. 308 



Oldys's British Librarian^ bibliographical notice of, xiii. 299. 



Curious anagram of Oldys on his own name, 300 

 defiant gas, observations on the oil obtained from, ii. 166 

 Olive oil, test for, ix. 185 

 Olive-trees, method of propagating, v. 356 

 Olivine, a new product from the gum of the olive-tree, ii. 178 

 Onions, beneficial effects of salt in the culture of, x. 60 

 Oolitic series of rocks in England, notice of, xiv. 149 



L 2 



