592 
SECOND REPORT- 1832. 
extent to which the theory of M. Elie de Beaumont appeared 
to be confirmed by the phenomena described. 
Dr. Daubeny communicated his views of the geological in¬ 
ferences to he deduced from the chemical constitution of springs 
and of sea water , and proposed the following queries, as sup¬ 
plementary to those which he had formerly printed and circu¬ 
lated. 
1st, Is the quantity of iodine and bromine in the waters of 
different seas equable at the same or at different depths ? 
2nd, Are these substances found in all countries in salt 
springs, and are they confined to such springs ? 
3rd, Does the flocculent or mucus-looking substance which 
exists in many thermal springs, always exhibit traces of an or¬ 
ganic structure, when recent; and is the same appearance con¬ 
stantly presented in springs of the same chemical constitution ? 
4th, What are the gases given out by hot springs, and what 
connexion do such springs appear to have with volcanoes ? 
A discussion ensued respecting the existence and cause of a 
central heat, in the course of which Mr. John Taylor de¬ 
scribed the action of hot water upon glass , and gave an account 
of an experiment suggested by the late Dr. Wollaston, for 
measuring the corroding power exercised by steam under pres¬ 
sure upon different kinds of glass. 
Dr. Buckland communicated a scale of geological colours , 
which had been adopted by the Board of Ordnance, and which 
will in future be employed in the colouring of all the different 
sheets of the Ordnance Map: he thought that if geologists 
would agree in the general adoption of this scale, the unifor¬ 
mity of geological signs which would be thus introduced would 
be advantageous to the science. 
Notices of the Geological Structure of the Island of Pantella- 
ria. By The Duke of Buckingham, F.G.S. &c. 
The author’s description of this volcanic island is derived 
from a survey in the year 1828, in which he was accompanied 
by Signor Donati of Naples. It is distant from the nearest coast 
of Sicily 56 nautical miles, from Africa 36 miles; is of an elliptical 
contour ; in length, 10 miles from N.W. to S.E. ; in breadth, 
5 miles; its circumference, 25 miles ; its greatest elevation 
above the sea, 3500 feet. The rugged masses of volcanic rock 
which compose the uninviting shores of this island, continue 
