210 Serentific Intelligence. 
tubes containing it. Its composition was determined by synthe- 
sis and by analysis. Synthetically, the residual gas after the ac- 
tion was withdrawn by a mercury pump and measured; it was 
one-eighth of the original gas, corresponding to the equati 
foe ; or in volumes 4-+-4 originally and 1 finally. 
Analytically by opening the tube under a titered stannous chlo- 
ride solution, the excess of oxygen was determined; and y pre- 
cipitation with barium chloride, the sulphuric acid was ascer- 
ained. The ratio obtained was SO,:O::10:1; the theoretical 
ratio 8,0,=(SO,),: O or 160: 16. The same result was reached 
oxygen rapidly in presence of platinum sponge. Treated with 
sulphurous acid, hyposulphuric acid is formed. Barium hydrate 
gives barium persulphate, which is soluble in water—C. R., 
hundred cubic centimeters of this water distilled from pure baryta, 
ecm 
gave a distillate in which platinice chloride produced a precipitate. 
— Ber. he B. 
ae : . : = Ks eee erg Bae 
With zine dust, it gives fluorene, and with lime, diphenyleneketone. 
