148 ir/Dfi:^. 



Oolitic formation, remarkable, notice of, xix. 363 



Ophtlialmia, Indian remedy for, x. 193 



Opium, observations on the nature of, iii. 105 



• ' assuages hunger, vi. 1 1 



" British apparatus for the manufacture of, viii. 230. In- 

 structions for collecting and making, 238. ix. 69 



« improved process for extracting the salt of, xii. 331 



— successful culture of English, xv. 139. xix. 141 



« — effect of the solution of, when injected into the veins of an 



hysterical patient, xvii. 145 



Optic nerves, on semi-decussation of, xvii. 259 



Optical instruments, on the indistinctness of vision caused in, by 

 false lights, and remedies for it, xvii. 17, 202 



> inventions of Professor Amici, account of, xii. 398 



Optics, prize question in, x. 16S. Account of an optical decep- 

 tion, 282 



Orchard-trees, cleansed by lime, xiii. 423 



'OrchidecE, description of three species of, iv. 199 



— select, from the Cape of Good Hope, described, v. 104. 



vi. 44. viii. 220. ix. 310 



Orpila's (M.) -Toxicologie Generale^ iii. 34. Plan and division of 

 his work, 4a. Classification and treatment of corrosive poisons, 

 47. Astringent poisons, 50. Acrid poisons, 51. Narcotic 

 poisons, 53. Narcotic acrid poisons^ ib. 



Organic remaiiis, discovery of, vi. 169. xiii. 437. xv. 172 



substances, effects of the simultaneous application of 



gaseous oxygen and alkalies on xx. 388 

 Organs (sentient), difference of texture in, the cause of the varie- 

 ties of sensation, ii, 3. Changes in the mechanism of the 

 organ of sense, 5. Of taste and smell, 6. Of touch 7. The 

 seat of these sensations proved, 9. Affinity between changes 

 excitmg sensations of cold and heat on the external surface, 

 and those which occasion sensations of nausea and thirst on the 

 internal, 13. Changes in the organs of voluntary motion pro- 

 •duced by fatigue, 14. The use of stated, 17. Simple mecha- 

 nical distension the cause of action in involuntary organs, 17 



