APPENDIX. 527 



1852. 



On Two New Processes for the Detection of Fluorine when accom- 

 panied by Silica ; and on the Presence of Fluorine in Granite, Trap, 

 and other Igneous Rocks, and in the Ashes of Recent and Fossil 

 Plants. Trans. R.S.E. 



On a supposed Meteoric Stone, alleged to have fallen in Hampshire in 

 September 1852. Trans. R.S.E. 



1853. 



On Nitric Acid as a Source of the Nitrogen found in Plants. Trans. 

 R.S.E. 



1855. 



On Colour-Blindness in Relation to the Danger attending the Present 

 System of Railway and Marine Coloured Signals. Trans. R.S.S.A. 

 Reprinted as Supplement to Researches on Colour-Blindness. 



On the Extent to which the received Theory of Vision requires us to 

 regard the Eye as a Camera Obscura. Trans. R.S.E. 



On the Artificial Preparation of Sea-Water for the Aquarium. Read to 

 British Association : published in Edin. New Phil. Journal. 



1856. 



On the Transmission of the Actinic Rays of Light through the Eye, and 

 their Relation to the Yellow Spot of the Retina. Trans. R.S.E. 



1857. 



On M. J. Nickl^'s Claim to be the Discoverer of Fluorine in the Blood. 

 Read to R.S.E. : published in Edin. New Phil. Jour. 



On the Electric Fishes as the Earliest Electric Machine employed by Man- 

 kind. Read to Brit. Assoc. : published in Edin. New Phil. Jour. 



On the Production of Photographs on Fluorescent Surfaces. Journal 

 of Photographic Society. 



1859. 



On the Recent Vindication of the Priority of Cavendish as the Disco- 

 verer of the Composition of Water. Read to R.S.E. : published 

 in Athenaeum. 



On Dryness, Darkness, and Coldness, as means of preserving Photo- 

 graphs from fading. Journal of Photographic Society. 



On the Fruits of the Cucurbitacea3 and Crescentiacea3. Trans. Edin. 

 Botanical Society ; and Edin. New Phil. Journal. 



On some of the Stages which led to the Invention of the Modern Air- 

 Pump. Read to Brit. Assoc. Report of B.A. for 1859. In brief 

 abstract. 



On the Employment of the Electric Eel, Gymnotus Electricus, as a Me- 

 dical Shock-Machine, by the natives of Surinam. Do. do. 



On the Statistics of Colour-Blindness. Do. do. 



