510 Transactions. — Geology. 



The place of our camp on Euapehu is given by the follow- 

 ing bearings : North peak, 146° ; needle-like rock, 128° ; top 

 of Ngauruhoe, ca. 18°. j 



The aim is taken through dioptra from south to north. 

 North has the figure 0, or 360 ; east the figure 90 ; south the 

 figure 180 ; and west the figure 270. The given bearings 

 indicate the reading of the north end of the needle. There- 

 fore the reading means that the object is towards the north ; 

 reading 90, towards the west ; reading 180, towards the south ; 

 and reading 270, towai'ds the east. 



The needle-like rock on the right outline of the slope of the 

 north peak is unmistakable. If you should be in doubt, there 

 being some sharp points, take the one most to your right. I 

 could not warrant there will always be water in the gully, 

 but I believe there is generally. 



Always take bearings from your camps before leaving 

 them, the more so on the rolling tussock-plains or on the 

 lower parts of the slopes. The bush-patches are difficult to 

 identify from above, and when you return it is unpleasant 

 to be in doubt as to where your camp and your provisions are 

 waiting for you. This I mention out of sad experience. 



Art. XLIX. — The Volcanoes of the Pacific. 



By Coleman Phillips. 



\^Read before the Wellington Philosophical Society, 17th August, 1898.} 



Plate LI. 



First Line of Activity. 



In December, 1894, I went down to Tonga and Samoa from 

 Auckland in the s.s. " Upolu." "Whilst lying at the wharf at 

 Nukualofa, the capital of Tongatabu, the most southern of 

 the three great islands of Tonga (the middle one being named 

 Hapaai and the northern island Vavau), the steamer was 

 shaken against the wharf by a sharp earthquake shock. No 

 one took any notice of the matter, as earthquake shocks are 

 common in Tonga ; but it led me to inquire further into the 

 question, and my inquiries resulted in finding that the situa- 

 tion of this particular group of islands will be found most 

 interesting to the student of earthquake phenomena in the 

 Pacific. 



At Auckland I was well acquainted with the remarkable 

 group of extinct volcanoes surrounding Dairy Flat — including 



