undergone hy its Salts at High Temperatures. 313 



found crystallizes. At 30° C. it loses one atom of water; at 

 100° C. it becomes quite anhydrous. 



Of the salt, 0-5575, dried at the ordinary temperature, gave 

 0*452 sulphate of baryta, or 53*207 per cent, of barytes ; 

 which makes the atomic weight 3956*8, the calculated one 

 being 3600-10. The salt dried by 30° C. gave 54*426 per 

 cent, barytes. That dried at 100° C. is composed of 1 atom 

 of malic acid and 2 atoms of barytes. 



Malate of Strontian. M 2 St O + 3 aq 



M 2StO + 2aq(l00°C). 



FUMARATE OF Oxi DE OF iETHYL. 



This aether is formed whenever malic acid is brought into 

 contact with muriatic aether. Malic acid also, when long 

 mixed with absolute alcohol, or with strong fuming hydro- 

 chloric acid, is converted into fumaric acid. 



This combination, or fumaric aether, is heavier than water, 

 and has a grateful odour, like that of fruit. It is slightly 

 soluble in water, and is therefore better separated from mu- 

 riatic aether, when mixed with the latter by distillation, than 

 by means of water. By potash, fumaric aether is converted 

 into alcohol and the fumarate of potash. Kept long in con- 

 tact with ammonia, it is converted into fumaramide. Purified 

 by being distilled over chloride of calcium, 033 1 5 aether 

 gave 0*208 water, and 0*669 carbonic acid. Hence 



Calculated. Found. 

 8 atoms Carbon . . 611*48 56*29 55*803 

 6 ... Hydrogen 74*87 6*89 6*97 



4 ... Oxygen . . 400*00 36*82 37*22 



1086*35 

 Fumaramide. C 4 H O 2 , N H*. 



This amide is obtained when fumaric aether is left a long 

 time in contact with an excess of caustic ammonia. Its forma- 

 tion is quite analogous to that of oxamideand the other com- 

 pounds of amide. In cold water and absolute alcohol it is 

 quite insoluble. It is soluble in boiling water, and again 

 precipitates as the water cools. Left long in contact with 

 water, it is completely converted into fumarate of ammonia. 

 Ammonia is disengaged by the fixed alkalies, and a fumarate 

 formed. By distillation it is decomposed into ammonia; a 

 white body, probably maleinic acid, and a residue of charcoal 

 are left. 



0*426 of fumaramide gave 0*1335 water, and 0*2780 car- 



