It will be seen at a glance that, in every such case and in every such example, the infection is not inevitable, but the simple result of gross carelessness and ignorance. In certain Hospitals it has been the custom to set apart wards for what are called “infectious” diseases; but, in reality, there ought to be no diseases considered such. It follows from what has been stated that, with proper sanitary precautions, diseases reputed to be peculiarly “infectious” may be treated in wards among other sick without any danger; just in the same way as, with proper sanitary precautions, a number of healthy people may be congregated together without becoming subject to the horrors of the Black Hole of Calcutta. It is in the highest degree probable that we should never have heard of “infectious” wards, if the other wards of a Hospital had been supplied with sufficient space and air for the sick; and in too many cases it is to be feared that the presumed “infectious” cases are huddled away into small, ill-lighted, ill-ventilated rooms, a kind of Lazaretto, in fact, where, if they die, they have at least been kept from doing harm to the other sick in Hospital! It is high time that common sense should deal with the question; for there does not seem to be much hope for a deliverance from these superstitions from any other quarter. The “infectious” wards in Military Hospitals correspond, in some sense, to the “casualty” wards in Civil Hospitals, into which accidents, noisy, and erysipelatous cases are transferred, when necessary. The advantages of a separate set of wards for this class of cases have been already insisted upon in these Notes; not certainly because the cases are inevitably “infectious,” but because the segregation of such facilitates greatly administration and nursing, while it removes offensive and noisy patients out of the Hospital wards, whose inmates they would annoy. The question of infection or non-infection has nothing to do with the arrangement. No stronger condemnation of any Hospital or ward could be pronounced than the simple fact that any disease has attacked other patients than those first affected by it. “Infection” and incapable management, or bad construction, are, in Hospitals, convertible terms. It may be useful to mention what the meaning is of the words “epidemic,” “endemic,” “sporadic,” and “zymotic.” When a large number of people are attacked simultaneously with the same form of disease it is said to be _epidemic_. When a small number, as, _e. g._, the inhabitants of a single court or alley, are so attacked, it is said to be _endemic_. When scattered cases of the same disease happen, one here, one there, over a large surface, the disease is said to be _sporadic_. The term _zymotic_, which includes all diseases of the preceding categories and some others, implies the existence of certain changes in the constitution or in the blood, rendering persons so affected liable to the diseases in question.