Lactation has also been considered by some authors as contra indicating the pleasures of love. Children it is said have been known to become convulsed, when nursing just after their mothers had indulged in sexual intercourse. Lascivious nurses have generally been regarded as bad. Many mothers, however, admit the embraces of their husbands, and their offspring does not suffer. We are far from thinking that the influence supposed to be exercised by the act of venery upon the milk of nurses, is entirely unfounded; hence this act should be used with moderation. _Influence which the act of venery may have, when coincident either with the action of other causes of disease, or with alterations in the constitution and health._ When an individual suddenly changes his mode of living, and the influences to which he has been exposed, and becomes a subject to new influences, his health most generally suffers to a certain extent. This is seen in the young man who comes directly from the pure air of the country into the confined atmosphere of the city, and in those who remove from the temperate to the torrid zone. The action of powerful causes of disease, of excessive heat, of deleterious exhalations, often adds to the simple change of habit. Thus all authors who have written on the diseases of warm countries, consider the act of venery, as one of the most active occasional causes of yellow fever, of malignant fevers, of cholera morbus, and generally of the severe diseases contracted by Europeans. A similar disposition may be seen in young men, who pass many hours in the infected atmosphere of hospitals, and particularly in dissecting-rooms, if they indulge with females or in onanism: typhus fevers have been caused by it. The individual who lives in a filthy neighbourhood, who experiences privations, who indulges to excess in wine or spirituous liquors, who labors hard either corporeally or mentally, who is deprived of sleep, who is affected with sadness, &c., bears the act of venery badly; it adds to the enervation already felt, and generally robs the individuals of health. Venereal pleasures should be abstained from, during the prevalence of epidemics: every person is then disposed to the prevailing disease, and a single act of coition may produce it. The influence of the act of venery is much more injurious, when the causes which we have mentioned, and generally all those which may impair the constitution, have affected it to a greater or less degree. Diseases of long duration, if badly treated, excesses and the causes mentioned above may bring the system to such a state, that enjoyments even if seldom indulged in, may produce great suffering and disease. Venereal excesses may also create predispositions and change them as well as those which have a different origin into other morbid affections.