96 
hard jet lines, running with the same regularity above 
the Cleveland seam as those, and worked to a considerable 
extent. 
Professor R. Hunt, F.R.S., of London, next rose to read 
a Paper, entitled " A short notice of the Recent Discovery 
of a Deposit of Iron Ore in Lincolnshire/ ' He said that 
before he commenced to read his paper, he would make a 
few remarks on the view set forth in the preceding paper 
respecting the origin of jet. He did not think the direct 
conversion of lignite into jet was made out. He was dis- 
posed to believe that the vegetable matter from which jet 
may have been derived, was first converted into a sort of fluid 
bitumen, which was eventually consolidated into jet. In 
fact there was evidence of this in the museum at Whitby, in 
examples of ammonites having bituminous matter still fluid 
in their cells. Something analogous to the process he had 
indicated was now taking place in the bituminous lake in 
the island of Trinidad. 
The Chairman asked if amber might be regarded in the 
same light ? 
Mr. Hunt replied that it was a matter for inquiry, but he 
believed not. 
Mr. O'Callaghan said that he had resided in Trinidad, 
and with regard to the bituminous lake, he might say that it 
was a volcano, in a state of constant ebullition, and not a 
vegetable asphalte lake. 
Mr. Hunt replied that the immense quantities of vegetable 
matter which were brought down to the sea by the great 
rivers of South America, might possibly re-appear in the 
shape of bitumen in this lake. 
Mr. O'Callaghan said that the Orinoco, which was the 
river alluded to, brought down great quantities of mud, 
though not of timber, and even if it did bring timber it 
would be intercepted before it reached Trinidad. 
