In this enlarged and improved edition of his work, several subjects have not been treated of so copiously by the author, as was requisite to render it acceptable as a book of reference; but the judicious notes of Dr. EMERSON, whose attention has been profitably directed to the investigation of venereal diseases, have well supplied the deficiency. A brief outline is here presented of the contents. The author describes the various symptoms in plain and intelligible terms; rejecting such unmeaning appellations as syphiloidal, pseudo-syphilis, &c. as designating no particular phenomena, and therefore of no use in describing a disease. He thinks there is a plurality of venereal poisons, and has divided the disease into four classes, from their different primary and secondary symptoms; making the eruptions on the skin the most certain criterion of distinguishing them from each other. These classes are:--the papular venereal disease; the pustular; The phagedenic; and the scaly venereal disease. The latter is the true syphilis. First, the Papular. This is the most common disease, and the most easily cured. Its primary symptoms are, a simple ulcer without induration, without elevated edges, and without phagedena. Sometimes there is a patchy excoriation of the glans penis, attended with a purulent discharge. This disease and gonorrhoea are caused by the same poison. The constitutional symptoms are:--fever; pain in the head, shoulders, and larger joints, pain in the chest; dyspnoea; a papular eruption on the forehead, chest, and back, sometimes extending in a more scattered way over the extremities. It is often attended with iritis. It never gives rise to nodes. The sore throat is different from that of syphilis; the latter having deep excavated ulcers. If buboes accompany it, they are mostly of an indolent nature. The eruptions do not all appear at once; but follow each other. When on the decline, they are of a pale red or copper colour, not scaly, as in syphilis, but papular; disappearing and recurring repeatedly, and ending in desquamation. _Remedies._--Venesection; cathartics; antiphlogistic regimen; antimonials, combined with decoction of sarsaparilla. Alterative does of calomel and antimonials, when the eruption declines. The local treatment consists in astringent washes and simple dressings. Iritis is to be cured by venesection, cathartics, mercury, blisters, and belladonna. This disease will yield to the powers of the constitution. Mercury is always injurious in the early stage. Second, Pustular venereal disease.