7G Proceedings of the Royal Society of Victoria. 



1872. — Campbell. — When visiting the group at that time, 

 I noted the ]jeriocl between eruptions as varying from four 

 to .six minutes, according to the state of the weathei-. In 

 the winter, when the trade winds were blowing and the 

 weather was fine, there would be hardly a minute of 

 difference in the intervals for weeks together. So far as I 

 recollect, there was no perceptible difference in the intervals 

 during the day as compared with those during the night, 

 that is, the temperature did not seem to affect the eruptions. 



1873. — Markham notes the eruptions as occurring every 

 three minutes. 



10th January, 1878. Neilson. — A tremendous eruption 

 took place, accompanied by an earthquake and an upheaval 

 of the land. A fortnight afterwards, this was repeated on 

 a smaller scale. 



April 1888. Watt. — A violent eruption took place, 

 accompanied by an earthquake, and further upheaval. 



The eruptions of this volcano may be conveniently divided 

 into three different classes : — 1st., The norma] or quiescent ; 

 2nd., the violent ; 3rd., the paroxysuial. I will ti-ea of 

 these in the order named : — 



1st. — The Normal or Quiescent State. 



The interval between the eruptions is on the average from 

 four to five minutes. When particularly sluggish, the 

 interval increases to as much as ei^ht minutes. A loiiii'er 

 tnne than this without eruptions has never been noticed, 

 according to the Rev. Thos. Neilson, who was resident for 

 14 years at Port Resolution, and tlierefore is a competent 

 authority on the subject. 



The sound accompanying each eruption is a loud report, 

 followed by a more continuous lumbiing, ali.nost exactly like 

 that produced by the firing of a heavy piece of ordnance, 

 and this is heard to a distance of about 30 miles. A sensible 

 vibration of the sound is felt at Port Resolution with each 

 explosion. The material ejected from the crater consists of 

 red hot lava in the fn-m of spherical bombs, large irre- 

 gular fragments, in some cases as large as a horse, clouds 

 of fine volcanic dust appeai-ing as densely black smokc^ and 

 steam. The heavy fragments are thrown to a height of 500 



