MB. J. MARTIN ON THE TEEEACES OE ROTOMAHANA . 



167 



extended 123 feet, and near the middle stood the " Lion Kock," a 

 mass of harder material (which had resisted disintegration), 35 feet 

 in length at its base and 10 feet in height. This encroached con- 

 siderably within the elliptical area of the Cauldron, rendering its 

 surface reniform in contour. 



Sketch Plan and Section of the White Terrace, Botomahana, 



in November 1885. 



Lake Rotornahana. 



The opening to the Tunnel was situated about 30 feet to the 

 south-west of the centre of the basin, at a depth of 30 feet below 

 the rim ; it measured 15 feet across, narrowing at a further depth 

 of 8 feet into a tube apparently 6 feet in diameter. 



The activity of the Geyser varied greatly. From furious ebullition 

 with a rushing overflow fully 10 inches in depth across the whole 

 opening, it wouhl subside into its normal discharge, welling up and 



