1819.] Scientific Intelligence. 293 
Esq. communicated through William Cosens, Esq. both of 
Gibraltar. srecay 
The rock is a mass of limestone, whose greatest height is about 
1,440 feet, and its base about 2,200 feet, in its longer diameter. 
The small rock on which the Devil’s Tower is built, appears to be 
a fragment fallen from it: the edge of the summit is in some 
places so sharp that a person cannot stand upon it. Part of the 
rock appears to have been much broken and dislocated, and in 
the intervals between the fragments, as well as in a cavern in the 
side of the east cliff, bones have been found incrusted with 
stalactitic carbonate oflime. The hills near St. Roque, reaching 
for a distance of several miles into Spain, contain large oyster 
and cockle, and other shells ; but the author has not examined 
the beds. , 
The ancient city of Carteia was built of the stone from these 
-ArticLte XII. 
SCIENTIFIC INTELLIGENCE, AND NOTICES OF SUBJECTS 
CONNECTED WITH SCIENCE, 
“I. Durham Coal Field. 
We understand that it is in contemplation at present to open 
the Coal Field of Durham into Yorkshire. In the meantime, a 
bill is to be brought into Parliament to carry a rail-way from 
Bishop Auckland to Darlington and Stockton. Mr. Stevenson, 
of Edmburgh, one of the most accomplished engineers of this 
country, has been called by the committee of subscribers to give 
an opinion as to the best line. The work is estimated at about 
120,000/., a great part of which is already subscribed. 
Il, Melting Points of Bismuth, Tin, and Lead. 
Mr. Creighton, of Glasgow, who has been long celebrated for 
the beauty and accuracy of the philosophical instruments made 
by him, and who has consecrated the evening of his life, ina 
great measure, to the manufacture of thermometers, has made 
some remarks on the boiling points of bismuth, tin, and lead, 
which deserve to be better known than they seem to be at pre- 
sent. He announced his determination of the melting points of 
these metals in an early. volume of the Philosophical Magazine ; 
but whether the facts to which I wish at present to draw the 
attention of the chemical reader were noticed by him in his 
original paper, I do not recollect, as I have not the early 
volumes of that work at present by me. If they were noticed, 
they seem not to have attracted the attention of chemists ; for [ 
