360 TRAVELS IN THE EAST INDIAN ARCHIPELAGO. 



polygons. They, therefore, exactly represent the 

 lines of concretionary structure frequently seen in 

 schists, and represented in nearly every treatise on 

 geology.* If this bubbling action should cease, 

 and in the course of time the clay become changed 

 by heat and pressure into slates, the similarity of the 

 two would perhaps be very close. Have, therefore, 

 the particles now forming the old schists which 

 show this structure been subjected to such mechani- 

 cal changing in their relative position to each other, 

 before they were hardened into the schists they now 

 form, as the particles of clay in this pool are im- 

 dergoing at the present time ? 



Near this large well was a hot-spring about three 

 feet in diameter, and two feet deep. Its temperature 

 was as high as 98° Celsius, 208.4° Fahrenheit, and 

 of course much steam rose from its surface. We 

 boiled some eggs here hard in a few minutes. The 

 water was pure and the natives living in the vicinity 

 frequently come and wash their clothing in this nat- 

 ural boiler. No trace of vegetation could be de- 

 tected beneath the surface nor on its edges where the 

 bubbling water splashed. At the foot of the hill we 

 visited a considerable lake which was strongly im- 

 pregnated with sulphur, and near it a pond of thick, 

 muddy water which in several places boiled up at 

 intervals. About twenty of these boiling pools are 

 found on this hill-side, and in the low, marshy land 

 at its feet. Up the hill above the mud- well first 

 described was a naked spot several yards in diameter. 



* For an accurate representation of these rings, see the drawings of 

 concretionary structure in Dana's "Manual of Geology, "p. 99, fig. 85. 



