Chemistry and Physics. 239 
¢ acid evolving hydrogen sulphide. Iron gave after four 
pressings a bl which was scarcely touched by the file and 
sulphide was formed easily in three pressings, the mass being 
Antimony gave a grayish black sulphide in two pressings. 
had the luster of antimony glance and dissolved in hot hydrogen 
result, as also: did carbon. Both this latter body and red phos- 
to about one per cent. Considering this as an impurity, analysis 
Ives the formula KBaPO,, (H,O),, for this sama phosphate. 
i i not a po 
6 On 
in the root of Saponaria rubra. : 
thorough investigation in Geuther’s laboratory. To prepare it 
ten kilograms of the bark of Quillaja saponaria was extracted 
uw 
Porcelain plates, pulverized, extracted with boiling alcohol, the 
