The _squamous syphilide_ is sometimes a continuance of the papular, and sometimes it begins as such. It is characterized by a variety of scaly macules and papules, which strikingly resemble the lesions of psoriasis. The latter are seldom seen on the palms and soles, while the squamous syphilide is very frequently seen in these locations. Moreover, along with the squamous lesions are frequently associated other skin lesions, which give the case a complex type, resembling at one point one of the non-specific affections, and others at other points. Such changes are mainly expressions of various stages in the involution or degeneration of the papule, but they may give the case a variegated appearance, in which pigmentation may be prominent. Some years ago Biett described a form of syphilide which he claimed was unmistakable and indicative. Since he described the lesion it has been known as _Biett’s collarette_. It appears in from ten to twenty weeks after the secondary symptoms are fully declared, is superficial, usually situated upon the trunk and extremities, but never upon the palms or soles. It consists of a flat papule almost level with the skin, 1 to 2 Cm. in diameter, rounded in contour, while around it there is seen a zone of white epidermal scales pretty sharply defined and giving it the name of collarette. The area within is dry and painless, and the ring itself narrow. There is little or no itching. It may be followed by some other skin lesion. The lesion is often so mild as to pass unnoticed. At other times _pustulocrustaceous syphilides_ will appear above the level of the skin, surrounded by a series of narrow concentric rings, not scaly, but composed of a number of small pustules, the first ring being perhaps an inch from the centre of the inner lesion. This is seen more often in males than in females, and it seems as though the smaller pustules were the result of an auto-infection of ordinary pyogenic character. In the presence of either of these lesions a positive diagnosis of syphilis can be made. The _pustular syphilide_ may give rise to large or small pustules, which soon become superficial ulcers, often irregular in shape, with an unhealthy floor which may be livid or gangrenous, or may resemble a diphtheritic lesion, while from its surface exudes a mixture of blood, debris, and pus, which dries into dark-colored crusts and constitutes the lesion known as _ecthyma_. These lesions are often deceptive, since while scabbing seems to be occurring over the surface the ulceration may be extending beneath. This is an intermediate or earlier tertiary rather than a secondary lesion.