182 On Sulphuric Acid and Naphthaline. [1826. 



Guiane or France Equinoctiale. Mem. de I'Acad. Roy ale, 1751. 



pp. 17, 319. 

 1763. MM. Herissant and Macquer on Solution of Caoutchouc. Mem. de 



I* Academic, 1763, p. 49. 

 1768. Macquer, Memoir on the Means of dissolving the Resin Caoutchouc, 



known by the name Elastic Resin of Cayenne, and making it appear 



with all its properties. Mem. de r Academic, 1768, pp. 58, 208. 

 1781. Berniard, Memoir on Caoutchouc, known by the name of Elastic 



Gum. Journ. de Physique, xvii. 265. 



1790. Fourcroy on the Sap furnishing Elastic Gum. Ann. de Chim, xi. 225; 

 again, Connaissances Chimiques, viii. 36. 



1791. Grossart on the Means of making Instruments of Gum Elastic, with 

 the Bottles obtained from Brazil. Ann. de Chim. xi. 143. 



1791. Fabbroni on Solution of Caoutchouc in repeatedly-rectified Petroleum. 



Ann. de Chim. xi. 195 ; xii. 156. 



Pelletier on Solution of Elastic Gum in Sulphuric Ether. Mem. de 



I'lnstitut, i. 56. 

 1801. Howison on the Elastic Gum Vine of Prince of Wales's Island, and of 



Experiments made on the Milky Juice which it produces, with Hints 



respecting the useful Purposes to which it may be applied. Asiatic 



Researches, v. 157- 

 1801 . Roxburg, Dr., Botanical Description of Urceola Elastica, or Caoutchouc 



Vine of Sumatra and Pulo-Penang, with an Account of the Properties 



of its inspissated Juice, compared with those of the American Caout- 

 chouc. Asiatic Researches, v. 167. 

 1803. Gough, Description of a Property of Caoutchouc or Indian Rubber, 



with Reflections on the Cause of the Elasticity of this Substance.-^- 



Manchester Memoirs, N. S. i. 288. 

 1805. Simple Method of making Tubes of Elastic Gum Caoutchouc, avoiding 



the expense of Ether. Phil. Mag. xxii. 340. 

 1807. Murray's Chemistry, iv. 177, contains a compendium of what was then 



known respecting this substance. 



Royal Institution, January 1826. 



On the Mutual Action of Sulphuric Acid and Naphthaline*. 

 [Read February 16, 1826.] 



IN a paper "On new Compounds of Carbon and Hydrogen," 

 lately honoured by tbe Royal Society with a place in the Philo- 

 sophical Transactions, I had occasion briefly to notice the 

 peculiar action exerted on certain of those compounds by sul- 

 phuric acidf . During my attempts to ascertain more minutely 



* Philosophical Transactions, 1826, p. 140. t pp. 160, 163, 164, 170. 



