are unusually and unduly devoted to sexual pleasures, and suffer unusual depression after sexual indulgence. The skin is tormented with a constant itching, and is alternately unduly hot or cold. Small grains are found under the tongue, as in leprous hogs. Gilbert divides leprosy into four varieties, _elephantia_, _leonina_, _tyria_ and _allopicia_, the pathology, symptoms and treatment of each of which are presented with wearisome minuteness and completeness. A long chapter, entitled "_De infectione post coitum leprosi_," discusses the transmission of the disease by means of sexual intercourse, and suggests the possible confusion of lepra and syphilis. The usual catalogue of specific remedies terminates the discussion. An interesting chapter on small-pox[9] and measles, "_De variolis et morbillis_," gives us the prevailing ideas relative to these diseases in England during the thirteenth century. Premising his remarks with a classification of diseases as follows: Diseases universal and infectious--like _morphoea_, _serpigo_, _lepra_, _variolae et morbilli_. Diseases universal but not infectious. Diseases infectious but not universal--like _noli me tangere_. Diseases neither infectious nor universal. Gilbert classifies _variolae et morbilli_ among the universal and infectious diseases, and in the species _apostemata_. To this latter species belong also _ignis Persicus_, _carbunculus_ and _antrax_. [Footnote 9: It is at least interesting to know that small-pox is said to have made its first appearance in England in 1241.] _Variolae et morbilli_ arise from moist matter confined in the body and turbid, like turbid blood. Hence the disease occurs most commonly in boys and in those who are careless about cleanliness and neglect venesection. It is the result of a disposition of the blood resembling putrescence, in which there occurs an external ebullition in the efforts of nature to purify the interior of the body and to expel to the surface the virulent material within. Accordingly the common people declare that persons who have suffered from _variolae et morbilli_ never acquire leprosy. Occasionally, too, the disease arises from excessive corruption of matter in repletion of blood, and hence it is more frequent in sanguineous diseases, like synocha, and during the prevalence of south winds or the shifting of winds to the south, and in infancy--the age characterized particularly by heat and moisture.