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SIR B. C. BRODIE ON THE CALCULUS OF CHEMICAL OPERATIONS. 



(9) Symbol of Pliosphorus. — Let the symtaol of the unit of phosphorus be a"(p"', and the 

 symbol of the unit of gaseous phosphide of hydrogen a'"^"''. Then, since 4 volumes of 

 the gaseous phosphide of hydrogen are decomposed into 6 volumes of hydrogen and 



* The symbols of nitric oxide, chloride of ammonium, and certain other substances, the densities of which 

 are apparently anomalous, will be subsequently considered (see Section VIII.). 

 t See Odletg's ' Chemistry,' pages 269, 254, and 261. 



