46 TECHNICAL DEUG STUDIES. 



On account of the cost and rather unpleasant odor of thioacetic 

 acid experiments were made substituting sodium thiosulphatefor it, 

 but although as much as 5 grams of the latter were used for 0.2 gram 

 of molybdic trioxid and the heating under pressure was considerably 

 prolonged the results were disappointing, the weight obtained in two 

 instances being 0.0815 and 0.0977 gram instead of 0.2039 gram. 

 Somewhat better, though by no means accurate, results were ob- 

 tained when yellow ammonium sulphid was employed. 



