S8G 



to potash formed by the combustion of potassium, then water was 

 instantly formed, and oxymuriate of potassium. 



The phenomena when sodium or soda are employed, are precisely 

 analogous to the former ; but the quantity of oxygen absorbed by 

 sodium, and extricated from it by oxymuriatic gas, is very nearly 

 twice as much as with potassium. 



When two parts of potassium are heated with common salt that 

 has been previously dried, the salt is decompounded ; and one part 

 of sodium is obtained in a very pure state by an extremely easy pro- 

 cess. 



From the experiments on sodium contained in the last Bakerian 

 lecture, Mr. Davy deduces the elementary number 22, as representing 

 the proportion in which it unites with different bodies. 



He observes also, that the proportions ascertained on the present 

 occasion to exist in the hydrates of potash and of soda, accord with 

 the supposition that they each contain one part of water, combined 

 with one of the respective alkali. 



The proportions also of potash or soda in different neutral com- 

 binations by these estimates (says Mr. Davy), will be found to agree 

 very nearly with those derived from the most accurate analyses ; and 

 as one instance, he refers to Dr. Marcet's analysis of muriate of soda. 



Since the muriates of barytes, lime, and strontia, when thoroughly 

 dried by exposure to a white heat, are not decomposable by boracic 

 acid, or by any simple attractions, Mr. Davy was led to suppose 

 that they consisted of their peculiar metallic bases, combined with 

 oxymuriatic gas ; and he is confirmed in this opinion by the result 

 of other experiments ; for when these earths are heated to redness 

 in oxymuriatic gas, the same dry muriates are formed, and oxygen 

 is expelled. The proportion which this oxygen bears to each earth, 

 Mr. Davy has not yet ascertained ; but he found it to be in the con- 

 stant ratio of one to two in volume of the oxymuriatic gas employed. 



When dry quick-lime was heated in muriatic gas, water was im- 

 mediately formed ; and it can hardly be doubted, says Mr. Davy, 

 that this arose from the union of hydrogen from the acid with oxygen 

 from the lime. 



The author next endeavoured to obtain the metals of barytes, 

 strontia, and lime, from their muriates by means of potassium ; and 

 though he did not succeed in separating them, he is of opinion that 

 either the bases of the earths were wholly or partially deprived of 

 oxymuriatic gas by this process, or that the potassium had entered 

 into triple union with their muriates. 



When small portions of the common metals were heated in oxy- 

 muriatic gas, they each inflamed, with the exception of gold, silver, 

 and lead. 



The product from arsenic was butter of arsenic highly volatile ; 

 that from antimony was butter of antimony easily fused, but crystal- 

 lized when cold. Those from tellurium, zinc, and bismuth, were very 

 similar to the preceding. 



