discover the signs which indicate the existence of these states. For these reasons I have not hesitated to give numerous cases and to detail many dissections. If after the study of these cases and dissections the practitioner be enabled at the bed-side of the fever patient to discover with greater precision and certainty than heretofore the condition of the brain—the condition of the lungs—the condition of the intestines, he will not think the time he has devoted to the investigation ill spent, nor shall I think myself without reward for the labour it has cost me to draw up the record. It is only when from external appearances we are able to see what is going on within each of the great cavities of the body, as clearly as we should do if their walls were transparent, that our interference can be sure of doing good, or secure from doing mischief: it is this kind and degree of knowledge alone which can teach us both when to act and what to do; and what is of almost equal importance, when to stop and to attempt nothing; and if the perusal of this work should contribute in any measure to the attainment of this knowledge, I shall not have laboured wholly in vain, “to add something to the treasury of physic.” CHAPTER II. _Varieties of Fever. Common Phenomena. Importance of this Analysis. Results of the Analysis. Organs always diseased in Fever: Functions always deranged in Fever. Fever not Inflammation: Distinction between these two States of Disease. Common Phenomena of Fever exemplified in Plague, in Yellow Fever, in the Varieties of the Fever of our own Country. Different Varieties produced by different Intensities of the same Affections. Received Classification and Nomenclature defective. What is really meant by Genera and Species of Fever. True Principle of Arrangement._ Fever is a genus consisting of several species, and each species presents many varieties. The external characters of these varieties and the internal states upon which they depend, are so opposite, that no two diseases in any two parts of the catalogue of nosology present a more diversified appearance, or require a more varied treatment, than may be the case with two different types of fever. The fever of one country is not the same as the fever of any other country; in the same country, the fever of one season is not the same as the fever of any other season; and even the fever of the same season is not the same in any two individuals. Many of the circumstances which constitute these varieties in the fevers of different seasons and of individual persons, are slight and trivial; but some of them are of the greatest possible importance, and those diversities, especially, which distinguish the fevers of different climates, are intimately connected with the causes, whatever they be, which render the disease mild or severe, and, consequently, comparatively innoxious or fearfully mortal.