CONTENTS. IX 



CHAPTER V. 



Origin of the nitrates Natural nitrification Chemical and thermal conditions 

 of nitrification Necessity for alkaline media and oxygen Transforma- 

 tion of free nitrogen into nitrogenous compounds Action of high and 

 low tension electricity 'Importance of atmospheric electricity in fixing 

 nitrogen on vegetable tissues .. .. .. .. Page 207-236 



CHAPTBR VI. 



Heat of formation of hydrogenated compounds of nitrogen Ammonia and 

 ammoniacal salts Volatility of ammonium nitrate Formation of hydro- 

 oxylamine, ethylamine, trimethylamine, oxamide, formamide .. 237-260 



CHAPTER VII. 



Heat of formation of nitrogen sulphide nitrogen selenide .. 261-263 



CHAPTER VIII. 



Heat of formation of compounds formed by the action of nitric acid on organic 

 substances Heat produced by their combustion inversely proportional 

 to heat produced by union of the acid with the organic principle Nitro- 

 benzene Dinitrobenzene Chloronitrobenzene Nitrobenzoic acid 

 Picric acid Nitric ether Nitroglycerin Nitromannite Nitric deriva- 

 tives from complex alcohols Nitrostarch Gun-cotton .. 264-289 



CHAPTER IX. 



Diazo-compounds Excess of energy which they contain Diazobenzene 

 nitrate Explosion Products of decomposition .. .. 290-296 



CHAPTER X. 



Heat of formation, decomposition, and combustion of mercury fulminate 



297-298 



CHAPTER XL 



Heats of formation of the cyanogen series Cyanogen Hydrocyanic acid- 

 Three methods adopted for measuring its heat of formation Potassium 

 and ammonium cyanides Mercury and silver cyanides Double cyanides 

 of mercury and potassium ; silver and potassium Potassium ferrocyanide 

 Cyanogen chloride and iodide Potassium cyanate .. 299-343 



CHAPTER XII. 



Oxygenated compounds of chlorine, bromine, and iodine Thermal formation 

 of chlorates Combustion effected by potassium chlorate disengages more 

 heat than by free oxygen Successive degrees of oxidation of chlorine 

 Perchloric acid and salts Explanation of the stability of the dilute acid 

 and instability of the pure acid Bromic and hypobromous acid lodic 

 acid Comparison of chlorates, bromates, and iodates .. 344-363 



