the crucible in a 600 cc beaker with 150 cc of distilled water and cover 

 with a watch glass. Put the crucible cover in the beaker, beside the 

 crucible, and slightly rotate and tilt the beaker so that all parts of the 

 crucible shall be touched by the water. Run in 13 cc of hydro- 

 chloric acid (specific gravity 1.19) from a burette and again rotate the 

 beaker slightly. Tip the crucible so that the other side comes in 

 contact with the acid liquor, allow it to stand a few minutes, and 

 remove the crucible and cover, washing the liquid adhering to them 

 back into the beaker by means of distilled water. Any fused material 

 adhering to the sides of the crucible can easily be removed with a 

 stirring rod. Place the beaker on the steam bath and heat for about 

 half an hour and then let it stand in the cold over night. Filter and 

 wash the insoluble residue. Heat the filtrate on the steam bath or 

 otherwise, and precipitate with a 10 per cent barium chlorid solution. 



In all of the determinations here reported the solutions were 

 precipitated by heating on the steam bath, adding 10 cc of barium 

 chlorid to the solution quickly, and stirring as soon as the precipitate 

 began to form. After adding the barium chlorid the solutions were 

 allowed to remain on the steam bath about one hour, and were then 

 removed to the table and stood in the cold over night, after replacing 

 any water lost by evaporation. All nitrations, except the solution of 

 the fusions of the barium sulphate with sodium carbonate, were filtered 

 through S. and S. blue ribbon filter paper. The fusions of the barium 

 sulphate were filtered through white ribbon filter paper and all precipi- 

 tates were washed with cold water. 



In this method a crucible loses from 0.3 to 1.3 grams of its weight 

 in each determination, an average of 0.9 gram as calculated from 20 

 determinations. By the peroxid method the crucible loses from 1.2 

 to 2 grams of its weight in a fusion, an average of 1.4 grams based on 

 13 determinations. Using a griddle hot-plate, 11 by 18 inches, 18 

 fusions can easily be made in a day. The only way in which a deter- 

 mination can be lost is by heating too rapidly on the hot-plate, thus 

 causing it to boil over or spatter. 



DESCRIPTION OF SAMPLES AND ANALYTICAL RESULTS. 



Total sulphur was determined by both the peroxid method and the 

 proposed method on five samples of dried white of eggs, three of which 

 were made from the same lot of eggs by boiling with various amounts 

 of copper sulphate, washing free of copper, and drying and grinding; 

 one was a sample of commercial dried albumin; and one was the white 

 of eggs boiled in the shell, dried, and ground. Sulphur was also 

 determined on four samples of mustard seed, and one sample of ground 

 mustard. A is pure white mustard, B is black mustard containing 64 

 per cent of charlock, C is commercial ground mustard, D is pure 



|Cir. 56] 



