bURHAM AND NORTHUMBERLAND. ! ?

of three different kinds ; and this liquid pro-duction, though not precisely the same in itsnature, is generally given out from all coals insimilar proportions, or one-eighth of the quan-tity analyzed.

One portion of the liquid is a tenacious oilyfluid, transparent, of a reddish or red browncolour, and more or less translucid ; it is of aninflammable nature, and on exposure to theair becomes resinous.

Next is a more watery fluid, or aqueousammonia, charged with oil and transparent:it is either quite colourless, or of a dilute yel-lowish colour: it is very inflammable, and burnswith a brilliant blue yellow flame : by exposureto the air it is partly volatilized, and leavesa residuum very much resembling the tenaciousoily fluid. When combined with concentratedsulphuric or nitric acid, this product is con-verted into a solid resinous matter soluble inalcohol.

The third product is a kind of mineral tar,being much thicker than either of the others,and of a dark brown or black colour. This is oneof the solid bitumens, and is obtained in greatquantities by distillation of the Bovey coal,and a similar species of coal "bund near Cologne,which is greatly bituminized. The Bovey coal

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