qf druggists) through iron turnings strongly ignited 

 in a gun barrel, or by the electrization of potash by a 

 strong Voltaic battery. 



25. Sodium may be made in a similar manner to 

 potassium. Soda or the mineral alkali being substituted 

 for the vegetable alkali. It is of specific gravity 940. 

 It is very combustible. When thrown upon water, 

 it swims on its surface, hisses violently, and dissolves., 

 but does not inflame. The number representing it 

 is 88. 



26. Barium has as yet been procured only by 

 electrical powers and in very minute quantities, so that 

 its properties have not been accurately examined. 

 The number representing it appears to be 1 30. 



Strontium the 27th, Calcium the 28th, Magnesium 

 the 29th, Silicum the 3Cth, Aluminum the 31st, Z/r- 

 conum the 32d, Glucinum the 33d, and Ittrium the 

 34th of the undecompounded bodies,, like barium,, 

 have either not been procured absolutely pure, or 

 only in such minute quantities that their properties 

 are little known ; they are formed either by electrical 

 powers, or by the agency of potassium, from the dif- 

 ferent earths whose names they bear, with the change 

 of the termination in urn ; and the numbers repre- 

 senting them are believed to be 90 strontium, 40 cal- 

 cium, 38 magnesium, 31 silicum, 33 aluminum, 70 

 zirconum, 39 glucinum, 11 1 ittrium. 



Of the remaining thirteen simple bodies, twelve 

 are metals, most of which, like those just mentioned, 

 can only be procured with very great difficulty ; and 

 the substances in general from which they are procur* 



