INSCRIPTION. TO Sir CHARLES LYELL, Bart., D.C.L., F.R.S. My Dear Sir Charles, To you, who, amongst the first, encouraged me to undertake the preparation of this little Work, I now heartily inscribe it; as a small acknowledg ment of the benefits I have derived from the perusal of your scientific writings, especially your ‘ Principles of Geology/ and of the uniform friend ship with which you have honoured me during man y years of my life as a migratory Geologist. Ever faithfully yours, 5th August, 1872. E. H.