ntact, while the phalanges have disappeared, or are represented by small atrophic remnants. In this respect they show well the characters described by Tedescog as present in syringomyelia, and which he regards as constituting a special type of bone affection. These characters are: (1) A general transparency of the bone shadows as a whole; (2) diminution and softening of the cortical layer of the diaphyses; and (3) rarefaction of the spongy bone while its gross structural form is retained, so that the external contour or form of the bone is preserved. When the process of atrophy is far advanced, however. the bone gradually disappears, as the skiagrams sh o w. The increased brittleness which accompanies this process of osteoporosis accounts for the occurrence of fractures. Spontaneous fractures, however, do not occur very f r equ ently in syringomyelia-not so much so as one would expect. At the same time, a certain amount of hypertrophy of bone, with lipping of and outgrowths from the ends of the bones, together with periosteal thickenings, go on side by side with atrophy; and similarly in the carti-. lages processes of absorption and new formation take place. Effusion of fluid into the joints is frequent; there seems little tendency to ankylosis. According to | | --::.:. X