Dr. G. Schweitzer's Analysis of Sea-tsoater. 51 



with blue. During its combustion, fluoric acid is developed, 

 and appears in white fumes. 



It is but little soluble in water, 100 of water at 60°, absorb- 

 ing \Q6 volumes of the gas. Its specific gravity was ri86. 

 It was composed of 



1 volume methylene 



1 volume fluoric acid 

 united together, and condensed into 1 volume; or it is com- 

 posed of 1 atom fluoric acid 1*25 



1 atom methylene 1*875 



3-125 

 So that its atomic weight is 3*125. 



4. Action of the oxacids on nyroxylic spirit, — When the ox- 

 acids are made to act upon pyroxylic spirit, two different 

 compounds are formed ; one corresponding with the aethers 

 formed by means of the same acids and alcohol, and which 

 are in reality neutral salts; another constituting acid salts, and 

 corresponding with althionic and other similar acids. 



The former, which are perfectly neutral, are obtained more 

 easily than the corresponding alcohol aethers. They all con- 

 tain an atom of C^ H^ O, united to an atom of the acid. They 

 are more volatile, and more stable than the corresponding 

 alcoholic compounds. 



[To be continued.] 



X. Analysis of Sea-water as it exists in the English Channel 

 near Brighton. By G. Schweitzer*, M.D. 



"DEING unaware of the existence of a correct analysis of 

 -■-^ sea-water as it exists in the British Channel, particularly 

 with reference to the quantity of iodine and bromine it con- 

 tains, I have undertaken at the request of several friends to 

 analyse it. It is not my intention to enter into the minutiae 

 of the process employed, particularly as I have on a former 

 occasion, in a small pamphlet entitled " An Analysis of the 

 Congress Spring of Saratoga in America," published in 

 March 1838, given a detailed account of the mode I adopt 

 in analysing mineral waters. The chief object I have in view 

 in the present communication is, to explain the method I have 

 employed in ascertaining the proportion of iodine and bro- 

 mine contained in a given quantity of sea-water. But before 

 I enter upon the subject, it may not be out of place to show 

 how far tests act upon iodine when in connexion with an 



* Communicated by the Author, 

 E2 



