OF ARTS AND SCIENCES. 39 



0.1944 grm. of salt dried in vacuo gave 0.0150 grm. H^O = 7.81 % 

 Calculated forNaC,n,(CIl3)N,03. 11,0 = 8.10% 



0.1790 grm. of dried salt gave 0.0G13 grm. Na^SO^; Na = 11.00 % 

 Calculated for NaCJI.CCigN.Og = 11.27 % 



Dibaric methylurate, BsLC^W^CR^^fi^ , S^HgO. 



This salt was made by dissolving one gr. of the acid in as little boil- 

 ing water as possible in a small flaj^k, and adding tweuty-Hve cc. of 

 cold saturated solution of baric hydrate. The solution was then boiled 

 for some time, corked up, and allowetl to stand. The salt separates 

 out in very minute needles, clustered together in places, and of a 

 slightly greenish tinge. The salt was collected on a filter, and washed 

 rapidly with a very small quantity of cold water, and then dried in 

 vacuo. The chief feature of this salt is, that it is the only one of the 

 salts obtained which shows the slightest tendency to assume a crystal- 

 line form. It is also the most insoluble of any of the salts. 



The salt prepared in this way gave, in several analyses, too great a 

 percentage of barium. It was found impossible to free it from the 

 excess of baric hydrate by washing on account of the ready solubility 

 of the salt. 



The water was determined as before, and the barium by ignition o'f 

 the anhydrous salt in a platinum crucible, and treatment with a little 

 sulphuric acid. The excess of acid was driven off, and then the crucible 

 heated for some time in a current of air to oxidize any sulphide which 

 might have been formed. 



o 



1.2318 grm. salt dried in vacuo gave 0.1979 grm. H^O = 16.06 % 

 Calculated for BaC,H(CH.)N,03 . 311120 = 16.57 % 



0.4738 grm. dried salt gave 0.365G grm. BaSO^; Ba = 44.07 % 



Calculated for BaC5H(CH3)N^03 = 43.22 % 



3fonobaric methylurate, BaC5(H(CH3)N^03)2 • 4H2O. 



For the preparation of this salt, about one gramme of the acid was 

 suspended in boiling water, and baric carbonate added until no more 

 would dissolve. The solution was then boiled for some time, and 

 filtered from the undissolved baric carbonate, and precipitated by 

 alcohol. On tiie addition of alcohol, it separates out as white powdei". 

 It is very soluble in hot water, and solidifies on coolins: into a white 

 jelly-like mass. 



