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THE UEOLOGT OE ATTCKLAKIX 
was Mr Dyson, and they went to his house, waited his return, 
and took several things from him. He was now a suspected 
man, and his conduct was watched /’ 
The second active crater of the Tongariro system, at the top 
of a lower cone north of Ngauruhoe, is called Ketetahi. Ac¬ 
cording to the natives, the first eruption of this crater took 
place simultaneously with the Wellington earthquake of 1854. 
From Taupo Lake I saw large and dense volumes of steam, 
larger than those from Ngauruhoe, emerging from the Ketetahi 
crater. The third active point on the Tongariro system is a great 
solfataraon the north-western slope of the range. The hot 
sulphurous springs of that solfatara are often visited by the 
natives on account of the relief they experience in respect to 
their cutaneous diseases. 
A grand impression is made upon the traveller by those two 
magnificent volcanic cones—Ruapahu, shining with the bril¬ 
liancy of perpetual snow—Tongariro, with its black cinder- 
cone capped with a rising cloud of white steam ;—the two 
majestic mountains standing side by side upon a barren desert of 
pumice (called by the natives, One-tapu ), and the whole reflected, 
as by a mirror, by the waters of Lake Taupo. 
Lake Taupo is about 28 English miles long, and 20 broad. 
This lake is surrounded by elevated pumice-stone plateaus, 
about 2000 feet above the sea, and 700 feet above the lake. 
The Waikato River, taking its rise from Tongariro, flows through 
the lake, traversing the pumice-stone plateaus on either side. 
In accordance with the names I have already proposed for the 
Middle and Lower Waikato Plains, the Taupo Country will 
form the “ Upper Waikato BasinU 
It is one of the most characteristic features in the structure of 
the Northern Island, that, from the shores of Taupo Lake, an 
almost level pumice-stone plain—-called Eaingaroa Plain — 
stretches at the foot of the East Cape range, with a very 
gradual descent to the coast between Whakatane and Matata 
o 
•—-a plain which, though now presenting a sterile appearance, 
will, I hope, at no distant day, be converted into fine grassy 
plains, capable of supporting large flocks of sheep. 
In a similar way, a higher volcanic plateau, consisting of 
trachytic tuff and breccia, and various other volcanic rocks, 
