SORBY

4pp., 12mo. Bifolium. Very good, on lightly-aged paper. He begins by commending the recipient's 'interesting paper': 'Of the justice of your remarks there can of course be no doubt, and even the small amount of knowledge that I have been able to acquire of the nature of rocks, has for some time past convinced me of the importance of what you '. He explains that he did his best 'in getting specimens of the Lafoten rocks, but the tast was very difficult and very unsuccessful, owing to the great hardness of the rocks. Quarries of course were absent'.?>

3pp., 12mo. Bifolium. In good condition, on lightly-aged paper. The letter is addressed to 'My dear Forbes' , and while there is a possibility that it is addressed to David Forbes, the reference to the recipient being 'still in existence' suggests James David Forbes, who had been in bad health since his return from Norway in 1851. It begins: 'Only a few days before receiving your note we had been talking of you and wondering if you really were still in existence, for we had heard nothing of you in any way for so long.