J. P. Cooke — New Mode of Manipulating Hydric Sulphide. 429 



production of effervescing drinks. After examining several of 

 the patterns in the market, we selected for trial the one repre- 

 sented below, which is manufactured by the firm of John 

 Matthews, of New York, at their establishment, — First Avenue, 

 26th and 27th Streets,— in that city. The apparatus was de- 

 signed by them for preparing that overcharged aqueous solution 

 of carbonic dioxide, which in the United States is Ea 

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

 used with equal efficiency for the preparation of a similar solu- 



tion of hydric sulphide. We have worked out the d 

 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 as in our own. The wood-cuts 

 are taken from the catologue of the firm, who have kindly 

 loaned the blocks for this paper; and we would her 

 our obligations to them for their great courtesy and liberality 

 <1 uri ng tlie whole course of our experiments. i , 



The apparatus consists of two parts, the ge: 



