440 Scientific Proceedings, Royal Dublin Society. 
a nitrometer, and accurately marked, as shown in the diagram, for 
containing or delivering charges of 40 and 50 c.c., respectively. 
In measuring off a charge, the vessel is first filled with mercury, 
and the three-way stop-cock F closed. It is then connected by a 
piece of thick-walled india-rubber tube with the bottle containing 
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the stock of potash solution, the mercury reservoir lowered, and the 
~stop-cock F turned so that liquid is drawn over from the bottle 
into the measuring vessel. Any bubble of air which may also be 
drawn over is got rid of through G, and the charge measured off 
