1865.] Destructive Distillation of the Sulphobenzolates. 357 



tillation of sulphobenzolate of ammonium, is washed with cold water to free 

 it from the ammonium salts with which it is accompanied, dissolved in 

 boiling water, and filtered to separate it from adhering traces of oil. On 

 the cooling of this solution, the impure sulphobenzolamide is deposited in 

 large micaceous scales. By one or two crystallizations out of spirit, and 

 one from boiling water, it is obtained perfectly pure and white. 



I. '350 grm. 

 II. -442 grm. 



III. '343 grm. 



IV. -237 grm. 

 V. -252 grm. 



VI. -432 grm. 

 VII. -124 grm. 



Theory. I. 

 C 6 =72 45-85 45-98 



gave -590 grm. CO 2 and -144 grm. H 2 O. 



gave -740 grm. CO 2 and '182 grm. H 2 O. 



gave -219 grm. platinum. 



gave '148 grm. platinum. 



gave '376 grm. sulphate of barium. 



gave '645 grm. sulphate of barium. 



gave -186 grm. sulphate of barium. 



II. 



H 7 = 7 

 N=14 



4-46 

 8-92 



4-57 4-57 



III. IV. 



9-03 8-84 



V. 



VI. 



S =32 20-38 

 O. 2 =32 20-38 



157 99-99 



VII. Mean. 



45-82 



4-57 



8-93 



20-46 20-48 20-58 20-51 

 20-17 



100-00 



These analyses correspond to the formula C 6 H 7 NSO 2 , which is that of 

 sulphobenzolamide, equivalent to sulphobenzolate of ammonium minus one 



atom of water, C * H * 1 S0 3 -H 2 0=C 6 H 7 NSO 2 . 



NH 4 J 



Sulphobenzolamide crystallizes in large and very lustrous micaceous 

 scales, greatly resembling naphthalin in appearance. It fuses at 153 C., 

 and recrystallizes on cooling ; when more highly heated, it volatilizes. It is 

 extremely difficult to reduce the dry crystals to powder, owing to their 

 toughness. When boiled with a strong solution of potash it gives off 

 ammonia, sulphobenzolate of potassium being apparently formed at the 

 same time. Weak acids have little or no action on it. The analyses were 

 made for me by my assistant, Mr. C. E. Groves. 



XII. " An Account of the Base-observations made at Kew Observa- 

 tory with the Pendulums to be used in the Indian Trigonome- 

 trical Survey." By BALFOUR STEWART, F.H.S., and B. LOEWY, 

 Esq. Received June 15, 1865. 



[This Paper will he puhlished in a suhsequent Number.] 



VOL. XIV. 



