132 /. Remsen on the Product of the action of 



duced, similar to that produced with sodic hydroxide. This 

 was filtered oflF from the solution of baryta-water and rapidly 

 washed out with hot water. During the process of filtration 

 the surfiace of the liquid on the filter was carefully protected 

 from the influence of the air by a perforated cover which was 

 connected with a tube containing potassic hydroxide. After 

 all baryta had been washed away, the residue was boiled with 

 alcohol, and again rapidly filtered in order to remove any un- 

 combined Ci^H.gOg. It was then dried and analyzed with 



409 100-00 



The formula is therefore C, ^H, .BaO.+H^O. The com- 

 pound is very stable. As was seen above it can be boiled 

 with alcohol or water without undergoing decomposition. It 

 is, however, decomposed by acids just as the sodium-compound 

 is, the substance C , jH, gOg being precipitated. 



Calcium- Compound, C , 2H , 4Ca06 +H2O. 



If lime-water is used instead of baryta-water, a precipitate is 

 produced, which is, however, of a beautiful lemon-yellow color. 

 This was purified in the same manner as the barium-compound. 

 The analysis gave the following numbers: 

 0-2172 grams of the substance gave 00937 grams CaSO4=0-0275 



HjjO 18 5-77 



312 100-00 



Magnesium- Compound. — When the body C.aH, ^0^ is boiled 

 in water with magnesia, a purple compound is produced, which 

 resembles the above described compounds in many respects. 

 This is probably the same compound that is mentioned by 

 Wislicenus as having been prepared in another way. 



We have here then a series of peculiar metallic compounds, 

 which are not salts in the usual acceptation of that term. The 

 substance C.gH, gO, is not an acid; at least it does not con- 

 tain the group COOH, for it is entirely unaffected by the alka- 

 line carbonates, and, its metallic compounds are themselves 



