Discovery of Iodine and Bromine in Salt Springs, S^-c. 235 



gious care the original telescopes of Galileo : the original re- 

 flecting telescope of Newton is carefully lodged in the British 

 Museum ; yet the first achromatic telescope, which displays 

 far more ingenuity and deeper philosophical research than 

 either, has not hitherto been deemed worthy of notice or pre- 

 servation by any scientific society in the country in which the 

 discovery was made. — Your's, &c. R. B. 



P.S. The notices respecting the discovery of achromatic 

 telescopes in the Annuaire are given as under : 



" Hall construit une lunette achromatique 1750 



Dollond public la decouverte des lunettes achro- 



matiques 1758." 



It should appear, however, from the note above quoted, that 

 Mr. Hall's discovery was made about the year 1733. 



XXXIII. On the Discovery of Iodine and Bromine in certaiti 

 Salt Springs and Mineral Waters in England. By Charles 

 Daubeny, M.D. P7-ofessor of Chemistry in the University 

 of Oxford. 



To the Editors of the Philosophical Magazine and Atmals. 

 "rjR. DAUBENY, professor of Chemistry at Oxford, will 

 -*-^ feel obliged to the editors of the Philosophical Magazine 

 and Annals, to announce among the other scientific notices in 

 the next Number of their periodical, the discovery which he 

 has made of iodine and bromine in several salt springs and 

 mineral waters of this country. 



He has obtained the latter principle in a separate state from 

 one of the Cheshire brine springs, and has fully satisfied him- 

 self of the existence of the former in two or three : but as he 

 has not yet had time to ascertain the proportions in which 

 they occur, must content himself, for the present, with this 

 simple announcement of the fact. 



He has found iodine not only in more than one of the 

 Cheshire salt springs, but likewise in several waters con- 

 taining purgative salts, such as those of Cheltenham, Lea- 

 mington, Gloucester, and Tewkesbury ; whilst bromine is of 

 still more frequent occurrence, and is perhaps entirely absent 

 from none of the English spi'ings which contain much com- 

 mon salt, except that of Droitwich in Worcestershire, al- 

 though the proportion in which it exists seems to vary consi- 

 derably. 



(JxfonI, Augusts, lH2y. 



P.S. The discovery in question was first announced at a 



mec'tini^ of a scientific society in this place on Friday, May 1. 



2 II 2 XXXIV. In- 



