OP ARTS AND SCIENCES. 



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apparatus is to be remounted, it would be better to use a metallic vessel 

 for the generator, aud to cover the glass bottles with some kind of 

 netting. The experience with the glass apparatus led us to seek to 

 adapt to the same purpose some one of the various soda-water appara- 

 tuses which are greatly used in the United States for the production 

 of effervescing drinks. After examining several of the patterns in the 

 market, we selected for trial the one represented below, which is man- 

 ufactured by the firm of John Matthews, of New York, at their estab- 

 lishment, — First Avenue, 26th and 27th Streets, — in that city. 

 The apparatus was designed by them for preparing that overcharged 

 aqueous solution of carbonic dioxide, which in the United States is 

 familiarly called soda-water ; but with a very slight modification it can 

 be used with equal efficiency for the preparation of a similar solution 

 of hydric sulphide. We have worked out the details of the process, 

 which this new application involves, and publish them with the hope 

 that the apparatus may be found of as great value in other laboratories 



Fig. 1. 



