350 SULPHURETTED HYDRO AND LIQUID SULPHURETS. 



EUDIOMETER OF DR. HOPE. 



" This eudiometer consists of a graduated glass 

 tube, sealed at one end, and at the other fitted, 

 by grinding, into the mouth of a tubulated glass 

 bottle, so as to be air tight. Manipulation, with 

 this instrument, is very simple. The tube is 

 filled with gas, the bottle with the liquid which 

 is to act upon the gas. The tube being, under 

 these circumstances, inserted into the mouth of 

 the bottle, by inverting both, the contained gas 

 is made to pass into the bottle. Agitation is 

 next to be resorted to, and time allowed for 

 the absorption to be completed. In the interim, 

 the tubulure is to be occasionally opened under 

 water, by removing a ground stopple with which 

 it is furnished. The gas absorbed, is conse- 

 quently replaced by water. 



" Finally, the stopple must be removed, the 

 tube being previously depressed into water, till 

 this liquid is as high on the outside as within. 

 The graduation being at the same time inspected, 

 the deficit produced by the absorption of oxygen, is thus ascertain- 

 ed.''!^. Hare. 



SULPHURETTED HYDRO-SULPHURET OF BARYTA. 



1 . This compound is formed either by boiling pure baryta (4 parts.) 

 in powder, or in crystals, with water upon sulphur, 1 part, or by de- 

 composing the sulphate of baryta by igniting it along with one sixth 

 charcoal powder for half an hour ; then dissolving it in hot water and 

 filtering. 



2. This a mixture of sulphuretted hydro-sulphuret and of hydro- 

 sulphuret, which last will crystallize on cooling. 



3. See general characters for the rest. This compound is very 

 useful in preparing the salts of baryta ; see the muriate and carbo- 

 nate. 



SULPHURETTED HYDRO-SULPHURET OF STRONTIA. 



The same in every respect as the last, only the decomposition of 

 the sulphate by charcoal is less striking. 



LIQUID SULPHURETS. 



1. This name is often given to the hydrogenated sulphurets, 



2. Indeed they seem to consist generally of a solution of sulphur 

 in an alkali, combined with more or less of sulphuretted or of bi-sul- 

 phuretted hydrogen. 



