43 
oe identical with that hitherto seen. From the highest point I 
ascended in the vicinity of Tabouri, I could see tier above tier of 
.either lava or conglomerate in the hills to the north-east, which I took 
.to be the Richardson Range of the Charts. 
This volcanic plateau presents many features in common with 
Ithose extensive deposits occurring in different portions of the northern 
portion of the Australian Continent, with which I am familiar. 
Passing along the coast from Port Moresby to Milne Bay, an excellent 
^opportunity for examining many of the hills, which familiarity with similar 
types, enabled me to recognise as being undoubled volcanic foci was pre- 
sented. The small island of Dobu (Goulvain) lying in the straits separa- 
ting Duan and Moratau in the D’Entrecasteaux Group, is from four to 
five square miles in area, and exhibits manifestations of volcanic 
activity. Approaching Dobu from Dawson Straits, the island was seen 
to possess that graceful contour which distinguishes many volcanic 
cones, and when viewed from the anchorage off Boduwagui Point, the 
highest summit seemed to be a truncated cone, having an almost level 
top, with numerous spurs running down to the beach. The seaward 
face of the cone is deeply furrowed by wooded ravines. In landing, I 
walked along the coast to the northward as far as certain points from 
which steam was seen issuing. The cliff sections showed nothing but 
brownish stratified sand and gravel, containing subangular pebbles of 
glassy lava and pumice. Some of the gravel is solidified into sand- 
stone, through which so called “ springs ” issue below high water mark. 
My first visit was paid at about the time of high water. There were 
several orifices extending over an area of about ioo yards, from which 
water issued at an average temperature of 200 degrees Fahrenheit 
The gas, which was given out copiously, had a strong sulphurous 
odour. 
A second visit to the locality at low water showed that the so- 
called “ boiling springs ” were merely fissures to which sea water had 
access. The sides of the fissures were encrusted with deposits of 
flowers of sulphur. A few yards behind the fumaroles was a whitish 
grey cliff, exhibiting undoubted evidences of solfataric action. In the 
caverns in the cliffs, there occur large deposits of yellow and greyish 
brown sulphur commonly massive, but here and there in the form of 
acicular crystals. These caverns, many of which I discovered when 
breaking down the cliffs with my hammer, were found to have a very 
high temperature 
Near the centre of the south-east end of the island is an extinct 
crater ; what now remains of it is a lofty circular wall, roughly estimated 
at about 100 feet in height. A lava stream, rising in the crater, has 
eaten its way through the wall, and enters the sea opposite the island 
of Mekumara. I scrambled along the crater wall (upon which a few 
