Occasionally a syphilitic child suffers from a succession of these gummatous lesions with resulting ill-health, and, it may be, waxy disease of the internal organs; on the other hand, it may recover and present no further manifestations of the inherited taint.

Affections of the Eyes.—At or near puberty there is frequently observed an affection of the eyes, known as chronic interstitial keratitis, the relationship of which to inherited syphilis was first established by Hutchinson. It occurs between the ages of six and sixteen years, and usually affects one eye before the other. It commences as a diffuse haziness or steaminess near the centre of the cornea, and as it spreads the entire cornea assumes the appearance of ground glass. The chief complaint is of dimness of sight, which may almost amount to blindness, but there is little pain or photophobia; a certain amount of conjunctival and ciliary congestion is usually present, and there may be iritis in addition. The cornea, or parts of it, may become of a deep pink or salmon colour from the formation in it of new blood vessels. The affection may last for from eighteen months to two years. Complete recovery usually takes place, but slight opacities, especially in the site of former salmon patches, may persist, and the disease occasionally relapses. Choroiditis and retinitis may also occur, and leave permanent changes easily recognised on examination with the ophthalmoscope.

Among the rarer and more serious lesions of the inherited disease may be mentioned gummatous disease in the larynx and trachea, attended with ulceration and resulting in stenosis; and lesions of the nervous system which may result in convulsions, paralysis, or dementia.

In a limited number of cases, about the period of puberty there may develop deafness, which is usually bilateral and may become absolute.

Changes in the Permanent Teeth.—These affect specially the upper central incisors, which are dwarfed and stand somewhat apart in the gum, with their free edges converging towards one another. They are tapering or peg-shaped, and present at their cutting margin a deep semilunar notch. These appearances are commonly associated with the name of Hutchinson, who first described them. Affecting as they do the permanent teeth, they are not available for diagnosis until the child is over eight years of age. Henry Moon drew attention to a change in the first molars; these are reduced in size and dome-shaped through dwarfing of the central tubercle of each cusp.

Diagnosis of Inherited Syphilis.—When there is a typical eruption on the buttocks and snuffles there is no difficulty in recognising the disease. When, however, the rash is scanty or is obscured by co-existing eczema, most reliance should be placed on the distribution of the eruption, on the brown stains which are left after it has passed off, on the presence of condylomata, and of fissuring and scarring at the angles of the mouth. The history of the mother relative to repeated miscarriages and still-born children may afford confirmatory evidence. In doubtful cases, the diagnosis may be aided by the Wassermann test and by noting the therapeutic effects of grey powder, which, in syphilitic infants, usually effects a marked and rapid improvement both in the symptoms and in the general health.

While a considerable number of syphilitic children grow up without showing any trace of their syphilitic inheritance, the majority retain throughout life one or more of the following characteristics, which may therefore be described as permanent signs of the inherited disease: Dwarfing of stature from interference with growth at the epiphysial junctions; the forehead low and vertical, and the parietal and frontal eminences unduly prominent; the bridge of the nose sunken and rounded; radiating scars at the angles of the mouth; perforation or destruction of the hard palate; Hutchinson's teeth; opacities of the cornea from antecedent keratitis; alterations in the fundus oculi from choroiditis; deafness; depressed scars or nodes on the bones from previous gummata; “sabre-blade” or other deformity of the tibiæ.

The Contagiousness of Inherited Syphilis.—In 1837, Colles of Dublin stated his belief that, while a syphilitic infant may convey the disease to a healthy wet nurse, it is incapable of infecting its own mother if nursed by her, even although she may never have shown symptoms of the disease. This doctrine, which is known as Colles' law, is generally accepted in spite of the alleged occurrence of occasional exceptions. The older the child, the less risk there is of its communicating the disease to others, until eventually the tendency dies out altogether, as it does in the tertiary period of acquired syphilis. It should be added, however, that the contagiousness of inherited syphilis is denied by some observers, who affirm that, when syphilitic infants prove infective, the disease has been really acquired at or soon after birth.

There is general agreement that the subjects of inherited syphilis cannot transmit the disease by inheritance to their offspring, and that, although they very rarely acquire the disease de novo, it is possible for them to do so.

Prognosis of Inherited Syphilis.—Although inherited syphilis is responsible for a large but apparently diminishing mortality in infancy, the subjects of this disease may grow up to be as strong and healthy as their neighbours. Hutchinson insisted on the fact that there is little bad health in the general community that can be attributed to inherited syphilis.