362 PROCEEDINGS OP THE AMERICAN ACADEMY 



the potassium salt by boiling with potassic hydrate, can be reconverted 

 into the chloride. The substance dried at 100° gave the following 

 results on analysis. 



I. 0.2358 grm. of substance gave after heating with soda-lime 0.1162 

 grm. of ammonic chloride. 

 '39 grm. of substance gave ace 

 0.8318 grm. of baric sulphate. 



grm. of ammonic chloride. 

 11. 0.3739 grm. of substance gave according to the method of Carius 



Properties. — The benzohrisulphamide crystallizes from boiling 

 water in shining flattened needles with very sharp ends, sometimes 

 nearly a centimeter long. It can also be obtained from water in 

 square prisms with oblique ends, apparently of the monoclinic system, 

 or in rhombic plates. From alcohol it crystallizes in long slender 

 needles. Its melting point is 310°-315° (uncorr.) ; it is only slightly 

 soluble in cold water, as shown by the following determination of its 

 solubility. 



I. 12 367 grm. of the solution saturated at 25° gave on evaporation 

 0.0172 grm. of the amide. 

 II. 11.164 grm. of the solution gave 0.0186 grm. of the amide. 



The solution of the benzoltrisulphamide saturated at 25° contains, 

 therefore, 



I. II. 



0.14% 0.17% 



It is much more freely soluble in boiling water than it is in cold, and 

 this is the best solvent for it ; soluble in alcohol, rather more so in 

 methyl than in common alcohol ; not very soluble in benzol ; insolu- 

 ble, or nearly so, in etlier, ligroine, chloroform, or glacial acetic acid 

 either hot or cold. The amide is much more soluble in a solution of 

 ammonia than in water, but it is thrown down unaltered when the 

 ammonia is driven off from such a solution by heat; it also dissolves 

 very easily in a solution of potassic hydrate, and this solution is not 

 decomposed, even when it is boiled for a short time. The hot aqueous 

 solution of the amide gives a white precipitate with mercuric nitrate, 

 but none with mercuric chloride ; a difference in behavior which is 

 not sur^jrising when it is remembered how differently these two 



