OF ARTS AND SCIENCES. 263 



tification converted it at once into the calcic methylalloxanate. We 

 followed closely the method which one of us had already described,* 

 and found to give constant results. Dimethyluric acid was dissolved 

 in the smallest possible quantity of nitric acid of sp. gr. 1.42, the 

 solution diluted with water, and the excess of acid neutralized with 

 calcic carbonate in the cold. After the solution was freed as nearly 

 as possible from carbonic dioxide, by allowing it to stand for some 

 time in vacuo, it was largely diluted with alcohol, filtered, and the 

 calcic methylalloxanate precipitated by the cautious addition of am- 

 monia. The carbon and hydrogen were estimated in this salt dried 

 at 100° by a combustion in a stream of oxygen, the calcium by igni- 

 tion with sulphuric acid. 



I. 0.2:334 gr. substance gave 0.2103 gr. CO,, 0.0439 gr. H 2 0, and 

 0.0921 gr. residue. This residue gave 0.1489 gr. CaS0 4 , 

 equivalent to 0.0G11 gr. calcic oxide. The residue, therefore, 

 contained 0.0311 gr. C0 2 . 

 II. 0.2172 gr. gave 0.1401 gr. CaS0 4 . 

 III. 0.22G8 gr. gave 0.1448 gr. CaS0 4 . 



18.78 



In confirmation of these results it seemed advisable to isolate the 

 methylurea which should be formed as the second product of the 

 reaction. We therefore oxidized with hydrochloric acid and potassic 

 chlorate, according to the method of Schlieper, evaporated at a gentle 

 heat until the greater part of the excess of hydrochloric acid was driven 

 off, and then separated from the potassic chloride with absolute alco- 

 hol. The residue left by the evaporation of the alcohol at a low 

 temperature gave with nitric acid crystals of methylurea nitrate, 

 which were purified by pressing between folds of paper and recrystal- 

 lization from water. 



0.2464 gr. gave 0.1G35 gr. CO, and 0.1147 gr. H 2 0. 



* These Proceedings, Vol. XII. p. 33. 



