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quantity is each day introduced into the privy 

 well. 



Suquet, Kraft and Schattenmann, (Direc- 

 tors of the mines at Bouxvillers,) have con- 

 tributed much valuable information, but this 

 mode, permanent and preventive, is so far 

 preferable to disinfecting at the time of clear- 

 ing the wells, that it entirely dissipates the 

 repulsive and disagreeable odor which so fre- 

 quently infects the apartments of a dwelling ; 

 and furthermore, also, because of the difficulty 

 in perfecting the disinfection at the time of 

 emptying, for in stirring the materials, the 

 deposition of the solid portions of the matter 

 in a compact mass presents an impediment to 

 their thorough incorporation. Still, however, 

 disinfection at the moment of clearing is not 

 impracticable. When you operate at the time 

 of emptying the sinks, the sulphate of iron 

 must be perfectly neutral, for the excess of 

 acid in the green vitriol of commerce suf- 

 fices to generate hydrosulphuric and carbonic 

 acids by the decomposition of the hydrosul- 

 phate and carbonate of ammonia. The hy- 

 drosulphuric acid gas is however the most de- 

 leterious of the disengaged gases. 



Faecal matters are not uniform in their 



