( 701 ) 



INDEX TO VOL. XXI. 



A 



Alkaloids [Vegetable), On tlie action of the halogen compounds of ethyl and amyl on some vege- 

 table alkaloids, 27. 



Amides of the Fatty Acids, researches on, 299. 



AiTDERSON (Thomas), M.D. Researches on some of the crystalline constituents of opium. Second 

 Series, 195. On the products of the destructive distillation of animal substances. Part Third, 

 219. Part Fourth, 571. 



Animal Substances, products of their destructive distillation, 219, 571. 



B 



Balfour (John Huiton), M.D. On certain vegetable organisms found in coal from Fordel, 187. 

 Bennett (John Hughes), M.D. An investigation into the structure of the Torbanehdl mineral, 



and of various kinds of coal, 173. 

 Boole (Geoege), LL.D. On the application of the theory of probabilities to the question of the 



combination of testimonies or judgments, 597. 

 Brown (James F.). On a general method of substituting iodine for hydrogen in organic compounds, 



and on the properties of iodopyromeconic acid, 49. 

 Buddhist Opinions and Monuments of Asia, compared vdth the symbols on the ancient sculptured 



" Standing Stones" of Scotland, 255. 



c 



Coal. An investigation into the structure of the Torbanehill mineral, and of various kinds of coal, 



173. 

 Coal from Fordel, on certain vegetable organisms found in, 187. 

 Chinoline and its homologues, 377. 



Cinchonine, on the volatile bases produced by the destructive distillation of, 309. 

 Colour. Experiments on colour as perceived by the eye, with remarks on colour-blindness, 275. 

 Combinations, on a problem in, 359, 



CoNNELL (A.). On a new hygrometer, or dew-point instrument, 15. 

 Crystalline Constituents of Opium, 195. 



D 



Davy (John), M.D. On the impregnation of the ova of the Salmonidce, 1. Some miscellaneous 

 remarks on the Salmonidm, 245. On the urinary secretion of fishes, with some remarks on 

 this secretion in other classes of animals, 543. 



DiatomacetB found in the Firth of Clyde and in Loch Fine, 473. 



VOL. XXI. PART IV. 9 B 



