1. The velocities of absorptions of carbon dioxide by the granular and the powder charcoals have been measured. 2. The velocity of absorption by the granular charcoal is smaller than that by the powder one. 3. It was confirmed that the absorption amounts by the granular and by the powder charcoal are the same. 4. The solubility of carbon dioxide in one gram of pure cane sugar charcoal at 25.0° and under 760 mm. has been determined to be 54.0 c.c. (N.T.P.). 5. The amounts of absorptions of carbon dioxide by various kinds of charcoals have been measured. Most of them absorb nearly equal amount of the gas, notwithstanding the divergence of the materials from which the charcoals were made. 6. The amounts of absorptions of carbon dioxide by bamboo charcoal at various temperatures and pressures have been measured. 7. The fact that the amorphous substance absorbs more gas than the crystalline one has been interpreted. 8. All of the facts mentioned above favoured the dissolution theory for the sorption of gas by charcoal.
1. The so-called diethyl dicyanoglutaconate has the composition (C11H12O4N2)2H2O and the constitution is considered to be represented by the formula (C10H12O4N)–CO–NH–C(NH)–(C10H12O4N). 2. The diethyl sodiodicyanoglutaconate is colourless when pure. 3. By the action of bromine on the so-called diethyl dicyanoglutaconate an addition product is obtained, which has the composition (C11H12O4N2)2·H2O·HBr·Br6. This is changed into the diamide hydrobromide, C11H16O6N2·HBr, in ether containing water. 4. The picrate of the diamide, C11H16O6N2·C6H2(NO2)3OH, is obtained from the diamide hydrobromide, from the bromine addition compound, and from the so-called diethyl dicyanoglutaconate. These three compounds are all changeable into the diethyl dihydroxydinicotinate.