MABEllY. — DETERMINATION OF SULPHUR. 



Distillate from crude Canada oil collected at 

 89°-Ul^ after one distillation under 50 mm. 

 and seven under atmospheric pressure 



Distillate from crude Ohio oil collected at 

 127°- 120° after one distillation under 

 50 mm. and seven under atmospheric pres- 

 sure 



Distillate from crude Canada oil collected 

 at I15°-117° after one distillation under 

 50 mm. and seven under atmospheric pres- 

 sure 



Distillate from crude Canada oil collected 

 at 120°-1.30° after one distillation under 

 50 mm. and five under atmospheric pres- 

 sure 



The same after shaking five times with alco- 

 holic mercuric chloride 



The same after shaking once with alcoholic 

 mercuric chloride with the addition of solid 

 mercuric chloride 



Sulphur oil from Canada sludge acid . . . 

 Sulphur oil from Canada sludge acid . . . 



Sulplmr oil from Canada sludge acid . , . 



Canada sulphur oil 



Canada sulphur oil 



Crude sulphide separated by mercuric chlo- 

 ride from fraction 110°-115° of sulphur oil 

 after the fifth distillation under 50 mm, 



A fraction of the same corresponding to pen- 

 tyl sulphide, percentage of sulphur, 18.39 



Percentage of Sulphur. 

 Combustion in Air. Carius. 



0.044 043 



0.0343 



0.173 



0.505 

 0.07 



0.086 



18.85 



0.036 



0.0108 



I. II. 111. 

 18.53 18.55 18,67 



These results were obtained by six persons working independently 

 of one another. 



The oxidation of nitrogen to any considerable extent by the use 

 of air in the combustion of sulphur compounds is evidently excluded 

 by the close agreement of the results it yields with corresponding 

 determinations by the Carius method. In accordance with the sug- 

 gestion of a friend, from the fact that nitrous and nitric acids are 

 formed to a greater or less extent depending upon conditions in tlie 

 ordinary forms of combustion, it seemed of interest to ascertain 

 whether these acids were present at all in the alkaline absorbent. In 

 testing for the formation of nitrous acid, the exceedingly delicate color 

 reaction was applied which is produced in an acid solution of a nitrite 

 by the addition of sulphanilic acid and naphthylamine chloride. An 



