Dr Whyte, who fell a martyr to his zeal in the investigation of the history of the plague, from a residence of some years in the Levant and some time in Egypt, had good opportunities of being acquainted with the diseases of that country, informed me, that, by making those under his charge, frequently during the day, wash the eyes with cold water in the season of the ophthalmia, he never failed in preventing the disease. He instanced particularly the sailors of the transports, of about one thousand of whom he had the medical charge. The captains of the different transports carried Dr Whyte’s preventive instructions into execution; and, though the disease raged both in the army and the navy, few of the sailors of the transports had it. By an attention to this mode of prevention, and in the season when the ophthalmia prevails most, making the soldiers wear something over the eyes, I think we should have the prospect of passing a second campaign, or season in Egypt, with less loss from ophthalmia. GENERAL REMARKS ON THE DISEASES. I have dwelt a considerable time on the two endemics, the plague and ophthalmia, the only diseases which we found peculiar to Egypt; and there do not many more diseases remain to detain us. We come next to a class including several diseases, and which are usually described separately: but, I am at a loss how to disunite them, as they occur all of them in India, and as they have for the most part appeared in the Indian army in Egypt. The diseases are fever, hepatitis, and dysentery; and, as I have for the most part seen them, there exists among them a most intimate and natural connection. For a long time, the same causes appeared indifferently to produce them: there was a frequent transmutation of these diseases one into another, and in the three diseases we succeeded by a similar treatment. In offering a few remarks, however, I will preserve a distinction, and speak of these diseases separately. Before entering on them I may remark, that the effects of the solo-lunar influence, so remarkable in fever hepatitis and dysentery in India, were in Egypt likewise very observable. In the treatment of these diseases the practitioner found his account in attending to the periods of the moon; at the full and the change, paroxysms would frequently supervene, if not anticipated; and, at these periods, convalescents would frequently suffer a relapse. OF FEVER.