Never were the effects of fear, in the treatment of diseases, more felt than at one period in the Indian army in Egypt. At the time the plague first broke out, (as shall be more particularly noticed hereafter,) the dread of the disease, particularly among the native troops, was a bar to every kind of treatment. They exclaimed that they were sent to the pest-houses merely to die; and some of them refused every kind of medicine or sustenance. I shall now advert to some of the principal measures of prevention of disease in general: some regulations regarding the plague are mentioned under the head of that disease. Within the last thirty or forty years the improvements made in the means of preserving the health of seamen have been great. These had their rise from the great Captain Cooke; after him, very much was done by Dr Lind, of Haslar-hospital; since, by Dr Blane; and, more lately, by the present able physician to the fleet, Dr Trotter. Under the eminent surgeon-general of the artillery, a very great deal has been done in the ordnance-department. Abroad, as well as at home, their hospitals and the medical department are in a state not unworthy of imitation. Since the time of the Carthagena expedition, a good deal has been done in the army likewise. To the present commander-in-chief the army owes very much; and the Army Medical Board have, of late, corrected many abuses, and introduced much improvement into the medical department: but much remains to be done for the soldier, especially when embarked for service. Often, during the late war, have we seen troops suffer much in transports; and, on one or two occasions, a confinement of two or three months on ship-board has crippled regiments, if not armies, and left them unfit for service. At no time, I believe, have troops on any expedition been so long confined on ship-board as during that of which we are treating; and in none I believe, not even in the shortest, has there been a smaller loss of men.