. . .I have only this day received your letter of the 6th, and I fear much you will scarcely receive this in time to make it available. I shall not be able to reach York for the commencement of the meeting, but hope to be there on Saturday, September 28th. A parcel will reach me in the shortest possible time addressed Sir P. Egerton, Donnington Rectory, York. I am delighted with the bright results of your comparison of the Sheppy fossils with recent forms. You appear to have opened out an entirely new field of investigation, likely to be productive of most brilliant results. Should any accident delay the arrival of your monograph for the York meeting, I shall make a point of communicating to our scientific friends the contents of your letter, as I know they will rejoice to hear of the progress of fossil ichthyology in your masterly hands. When next you come, I wish you could spend a few days here. We are surrounded on all sides by the debris of the moraines of the ancient glaciers that descended the flank of Ben Wyvis, and I think you would find much to interest you in tracing their relations. We have also the Cromarty Fish-beds within a few miles, and many other objects of geological interest. . .I shall see Lord Enniskillen at York, and will tell him of your success. We shall, of course, procure all the Sheppy fish we can either by purchase or exchange. . . The pressure of work upon his various publications detained Agassiz at home during the summer of 1844. For the first time he was unable to make one of the glacial party this year, but the work was carried on uninterruptedly, and the results reported to him. Meantime his contemplated journey to the United States flitted constantly before him. AGASSIZ TO THE PRINCE OF CANINO. NEUCHATEL, November 19, 1844.