186 Professor SepGwick on the 
2. He asserts, that they are filled from above, whereas it is 
demonstrable that some of them, and highly probable that all 
of them, have been formed by injection from below. 
3. He states, that they have, in some places, converted colum- 
nar anthracite into cellular anthracite. _But the fact is, that 
they have converted bituminous coal into anthracite, which is 
partly cellular and partly columnar. 
4. He asserts, that in the lower part of the English coal 
strata, there are beds of columnar anthracite—that anthracite is 
found at a distance from trap—and that the bad quality of coal 
in the vicinity of trap dykes, is not generally to be accounted for 
by the action of the trap. Now, I do not believe that there 
is a single bed of columnar anthracite in any part of the great 
coal-basin of Durham and Northumberland; and the universal 
fact is, that wherever a trap dyke passes through a bed of bitu- | 
minous coal, such coal is, for a certain distance on each side of 
the dyke, converted into a more or less pure anthracite, which 
is sometimes columnar. In short, there is not a single remark in 
the Essai Géologique sur U Ecosse, which makes me in any doubt 
about the correctness of the conclusions I have endeavoured to esta- 
blish, either in this or in my preceding Paper (supra, p. 21—44*.) 
* My only object in making the preceding remarks, was to take away the force of 
certain objections which might be urged against the conclusions I wished to draw from the 
phenomena observed in High Teesdale. I think that the descriptive part of Boueé’s 
Work is often excellent, and, whatever inaccuracies there may be in certain parts of its 
details, that it contains much highly interesting and yaluable information. 
