ABSORPTION OF THE CASKS, 291 



one to the olher is fudtlen, and (he lines of demaskation are 

 diftaicl. The ochrous ftone is never found but contiguous to 

 other bafalt. 



2. The fubftances imbedded in the ochrous rock, and in ba- 

 lalls, are exadly the fame; calcareous fpar, zeolite, chalce- 

 dony, &c. 



3. Among the varieties which this rock prefents, there may 

 be found every intermediate flage between found bafalt and 

 perfect ochre. The change is often partial, beginning with 

 veins and flender ramifications. 



V. 



On the Abforption of Gafes bj/ Water and other Liquids. By 

 John Dalton,* 



1. IF a quantity of pure water be boiled rapidly for a (hort Air or gas is 

 time in a veflel with a narrow aperture, or if it be fubjefled to wate"by bdni^- 

 the air-pump, the air exhaufted from the receiver containing and agitation ia 

 the water, and then be brifkly agitated for fome lime, very ^^^^°' 

 nearly the whole of any gas the water may contain, will be 

 extricated from it. 



2. If a quantity of water thus freed from air be agitated in The volume of 

 any kind of gas, not chemically uniting with water, it will fj^^^^/^y"^^'^^^ 

 abforb its bulk of the gas, or otherwife a part of it equal to is conftant, and 

 fome one of the following fraaions, namely, |, ^, ^V» t1 s' Jhe'btikTto '"' 

 &c. thefe being the cubes of the reciprocals of the natural the cube of a 

 numbers 1, 2, 3, &c. or j,, J^, x^, x^, &e. the fame gas [-^-^^^^^ 



always being abforbed in the fame proportion, as exibited in 

 the following table : — It muft be underftood that the quantity —equal prer- 

 gf gas is to be meafured at the preffure and temperature with peratuies bei'ng 

 "jjUich the impregnation is effected, fuppofed, 



* Manchester Mem. N. S. Vol.1, 



Bulk 



