While the absence of pus takes these out of the category of pyogenic infections, it nevertheless leaves them still as surgical complications which have often to be dealt with by mechanical measures, such as orthopedic apparatus, etc.; while more or less formidable operations, as for relief of ankylosis, have to be performed. Postscarlatinal arthralgia may be explained as a local ischemia; so may acute swelling or chronic thickening. But pus is an expression of infection, and cannot be otherwise regarded. Retropharyngeal abscesses and a peculiar necrosis of the alveolar process of the jaws, described by Salter, are among the various serious surgical complications of scarlatina. Epiphyseal separations and purulent destruction of ribs have also been noted. TYPHOID FEVER. Although in elaborate treatises, as by Liebermeister and Murchison, there is no mention of bone and joint complications as sequels of typhoid, they have, nevertheless, been recognized by surgeons. Post-typhoid hip dislocations have been reported by several German surgeons. Boyer observed spontaneous dislocation of both thighs after what he called “essential fever,” and the general topic of spontaneous luxations subsequent to typhoid has been frequently discussed. Those affections of joints formerly considered rheumatic occur much less often after typhoid than after dysentery. Nevertheless, post-typhoidal arthralgia and myodynia have been recognized by several French writers. Some with affected joints, supposed to be rheumatic, have later been discovered to be suffering from genuine typhoid fever, and it has been afterward recognized that the joint lesion was a bizarre expression of the typhoid poisoning. The works on general practice call attention to the frequent complications of the pleural and pericardial serous membranes in this disease. They say little, however, about the implications of the articular serous membranes, though one is as easy to explain as the other. Post-typhoidal polyarticular serous arthritis has been described by more than one writer. Multiple joint abscesses have been rarely seen. Pus has been known to collect not only in the joints, but also in the tendon sheaths and bursæ. The lymph nodes are also frequently affected, and cervical, axillary, and inguinal abscesses are not rare. Post-typhoidal pyarthrosis, as leading to spontaneous luxation, has had a medicolegal interest, for luxation has been known to occur while raising or lifting a patient, the question of violence being subsequently brought into court. When the joint disease assumes the mono-articular form it is likely to terminate in suppuration; when polyarticular, pyarthrosis is less common. In the pus from many of these abscesses typhoid bacilli may be recognized, but by no means in all. The writer has found them in a case of abscess in the abdominal wall occurring during convalescence from typhoid in a young woman. A non-suppurative but painful form of periostitis is occasionally observed.