382’ PROCEEDINGS OF THE SCIENTIFIC ASSOCIATION". 
SoufEriere. Some in a valley near Roseau have an inter-' 
mittent action, and the steam and water is ejected in jets, 
accompanied by a deep sonorous noise, like that of a large 
steam-engine at work. The beats are about 20 a minute ; 
and at much longer but somewhat irregular intervals, a 
larger jet of water is thrown out, which, in most cases, 
sinks back into the cavity whence it issued. These sul- 
phur springs are usually situated in the steep banks of' 
ravines, and the small quantities of water which flow from 
them mingle with the streams flowing in the ravines. In 
such cases as that at Souffriere, however, the springs are 
higher up on the hills, and are surrounded by deposits of 
sulphur just as I have seen in Now Zealand. 
I was unable to determine precisely the temperature of 
these sulphur springs; but in most cases it is very high, 
and approaches the boiling point. Their waters seem to 
be highly charged with sulphuretted hydrogen, judging 
by the odor which is distinctly perceived for some distance. 
On the 18th of November an extraordinary rise of the 
sea took place. At Roseau the sea at the time was rather 
rough, and consequently the special phenomenon was not 
much noticed ; although some damage was occasioned to 
the sea-wall there in course of repair. On the following 
day, however, I went to Prince Rupert’s Bay, at the north 
part of the Island, and I was then shown the effects of 
this rise of the sea, which I at once inferred to be an 
earthquake wave. The first rise occurred at 4 o’clock on 
the 18th, and consisted of a long and gentle swell going 
up about 4 feet above high water mark, and descending 
as much below the ordinary low water — (the height of 
the tide at Dominica is about 2 to 3 feet.) This phenome- 
non recurred for about 2 hours, the waves becoming less 
each time. Each wave was stated to occupy about ten 
