and some of its Products of Decomposition. 59 



Repeated combustions did not enable us to lessen the percent- 

 age of hydrogen. The variation from the theory is, doubtless, 

 to be attributed to the absorption in the chlorid of calcium tube, 

 of a small quantity of sulphurous acid, which escaped from the 

 combustion tube. This explanation unfortunately occurred after 

 repeated analyses had consumed the stock of salt. 



This constitution is remarkable in the field of organic chem- 

 istry. On its borders we have a similar instance in anhydrous 



NHL+SO 



3' 



Sulphate of Hydrate of GlycocolL 



Gl, S0 3 , HO. 



This salt was obtained from a solution similarly prepared to 

 that which yielded the anhydrous salt, except that the solution 

 was boiled with sulphuric acid, instead of the latter being added 

 to the cold solution. It crystallizes in short prisms, reminding 

 one of sulphate of copper, and the crystals, though small, are of ex- 

 ceeding beauty and perfection of form. They do not change 

 upon exposure to the air. 



A single determination only was made, and that of the nitro- 

 gen. The other determinations were not made, from want of 

 substance, all subsequent efforts to form the salt having failed. 



By Varrentrapp and Will's method : — 



0-3367 grm. gave 0*2943 grm. platin-salammoniac. 



In per cent, expressed, Nitrogen 12-37. 



This corresponds with the formula 



C 4 H 4 N0 3 , S0 3 , HO, 

 which requires 12-17 per cent, of nitrogen. 



Basic Sulphate of GlycocolL 



(a.) 3G1HO, 2S0 3 , 2HO. 



If to a solution of glycocoll in dilated spirits of wine, sulphu- 

 ric acid in excess be added, and set aside, in twenty-four hours 

 long rectangular prismatic crystals form upon the bottom of the 

 containing vessel. A very considerable excess of sulphuric acid 

 did not change the constitution of the crystals. 



They taste and react acid, and like the salts already described 

 ufFer nothing from exposure to the air. 



Combustion with chromate of lead gave the following results: 



t 0*4199 grm. gave 0-3528 carbonic acid and 02149 water. 

 II. 0-3944 " " 0-3219 " " " 01974 " 

 HI. 0-2399 " « by Varrentrapp and Will's method, 0-5067 



nn. platin-salammoniac. 



IV. 0-6866 grm. gave 04928 sulphate of baryta 

 V. 7808 " " 0-4170 " 

 VI 4532 " " 0-3225 " " 



^11 0-4960 " " 0-3500 " u 



u 



