TABLE OF CONTENTS. 



I 'age. 



The rocks of the district 82 



The rock structure 83 



Igneous rocks 85 



Fossils 85 



Occurrence of the hot springs 85 



The hot-spring tufa deposit 88 



Geologic relations of the hot springs 89 



The hot-spring waters 90 



Gases 92 



Source of water ; 92 



Source of mineral contents of water 92 



Are the hot springs dying out 92 



Constancy of temperature 92 



Constancy of discharge 93 



Amount of mineral matter held in solution 93 



Source of heat ' 93 



