Abstract
The following observations were made during November 1862 and the two following months, when engaged with my friend the late Mr. A. H. Rhind, F.S.A., in making the usual boat-voyage from Cairo to the Second Cataract and back. That distinguished antiquary's knowledge of ancient Egyptian history, and his having formed a design of investigating the Nile-levels with reference to the records of the country, afforded me great advantages in carrying out my intentions in connexion with the still older memorials of the river-valley. Although well aware of the imperfections of these notes, I am not without hope that they may prove of interest to the scientific inquirer. Every field-naturalist knows how difficult it is to work at two widely different subjects at the same time,—such was my case on the above occasion; for with gun and hammer (as former experiences have taught me) I found it no easy matter to fulfil the requirements of an ornithologist and also to study the minutiæ of geology, especially as during our late excursion I seldom remained more than a few hours in any one locality; moreover, when starting for Egypt, I had no idea of the nature of the geological work before me, and, therefore, I was not provided with the necessary instruments for the exact determination of heights.

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