A small work was published on this subject about half a century ago by Bond, who places his principal dependence for cure on blood-letting. I do not deny but there are subjects in whom this remedy might be admissible, and perhaps advantageous; but I do not doubt, at the same time, that in far the greatest number of persons habitually affected with this disease, it would add fresh vigour to the monster, while it drains the vital powers of the struggling patient, and increases his danger. Bond carried this practice to a great length in his own person, but did not cure the disease. It is at best but a doubtful and a dangerous remedy. To those persons who are only occasionally subject to it, and who are generally most alarmed at it, as the disease comes upon them unexpectedly, and without their being always able to assign any cause for it, it appears difficult to apply a remedy, as the mischief is generally over before they are aware of its approach. A little attention however to the state of the digestive organs will generally point out to them, that it was connected with indigestion, flatulence, or costiveness; or perhaps all these together: frequently it is the consequence of having eaten some particular kind of food, which experience shews always to disagree with the stomach. There are certain kinds of food which will constantly produce this disease in such as are at all liable to it. Hildesheim, in his _Spiceleg. De Affectibus Capitis_, says: _Qui scire cupit, quid sit Incubus? is ante somnum comedat castaneas, et superbibat vinum fæculentum._ “He who wishes to know what Night-Mare is, let him eat chestnuts before going to sleep, and drink after them feculent wine.” I found by experience in the West Indies, that eating a particular fruit, called the alligator pear, would at any time of the day produce Night-Mare. This is a pulpy fruit, which, when cut into, resembles a custard, and is frequently spread upon bread, and eaten instead of butter, whence it has obtained amongst military men the name of subaltern’s butter, and it is certainly no contemptible substitute for fresh butter. I used frequently to eat it beat up with the juice of Seville oranges and sugar, in which case its action was almost instantaneous. So great a propensity to sleep came upon me, that I could not resist the temptation, though well aware of the consequences; so that I generally kept some person by me to awake me as soon as the Night-Mare came on, which was always in the course of a few minutes. I have frequently shewn this experiment to my medical friends, as I have hinted above. The articles most likely in this country to produce Night-Mare, I conceive to be cucumbers, nuts, apples, and all such things as generally produce flatulence. Whenever a person has discovered the offending article, it is certainly prudent to abstain from it, more especially in the evening. If however that state of stomach and bowels which gives rise