* 
ON HYPOSULPHITE OF SODA. 293 
dissolve it at the ordinary temperature of the air, or by 
means of a sand-bath, then filter the syrup through filter- 
ing paper. 
Thirty grammes of this syrup will contain one gramme 
of hyposulphite, and this will enable you to dispense from 
thirty to one hundred and twenty-five grammes in the 
course of four-and-twenty hours. 
No inconvenience appears to be attached to the use of 
the hyposulphite of soda, and this consideration, in addition 
to the incontestible advantages that result from its efficacy 
in cases of exanthemetic affections, painful irritations of the 
skin, slight congestions of the viscera, scrofula, lymphatic 
diseases, &c. This consideration, we say, ought to be an 
additional element of success for this preparation of sulphur, 
which more strongly fortifies us in our good opinion of its 
future favor. As to syrup in particular, it appears to us 
very right to favor the employment of this agent, which we 
also recommend with great earnestness, because it is at pre- 
sent extremely easy to have it always of a well defined 
strength and perfectly pure, thanks to its application to the 
purposes of daguerreotype processes ; for it must be well 
understood that the state of oblivion into which it had fal- 
len, was chiefly caused by the impure manner hi which it 
used to be prepared. — Chemist, from Jour, de Chimie. 
22* 
