360 TRAVELS IN THE EAST I^DUN ARCHIPELAGO. 



polygons. They, therefore, exactly represent the 

 lines of concretionary structure fi'equently seen in 

 schists, and representee! in nearly every treatise on 

 geology.* K this bubbling action should cease, 

 and in the course of tiine 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 otherj 

 before tliey were hardened into the schists they now 

 form, as the pai-ticles of clay in this pool are un- 

 dergoing at the present time I 



Near this large well was a hoi^spring about three 

 feet in diameter, and two feet deep. Its temperatui-e 

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

 of course much steam rose from its surface. We 

 boiled some eggs here hai'd in a few minutes. The 

 water was pure and the natives living in the vicinity 

 fi^quently come and wash their clothing in this nat- 

 ural boiler. No trace of vegetation could l}e de- 

 tected beneath the surface nor on its edges where tlie 

 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 iti several places boiled up at 

 intervals. x4.bout twenty of these boiling pools are 

 found on this hill-side, and in the low, mai'shy 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 ringft, see the drawings of 

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



