PART II.] Description of Specimens of the Dark Variety. 365 



ance of ordinary caries. The cancellous tissue of the end of the radius, and of such 

 portions of the carpal bones as remained, was very porous and widely opened out. 

 Where, however, the cavities were located among the soft tissues they were lined by a 

 membrane. The tendons were not affected. 



The large cavity, referred to as communicating with the surface by means of 

 various channels, occupied the space normal to the carpal bones, and was filled with 

 fragments of these bones mixed with black granular material, which also extended into 

 the channels alongside of the tendons. 



The black material, after prolonged immersion in liquor potassse, was found to 

 contain filaments, but they were by no means so plentiful as ordinarily observed. 



Not the slightest indication of any such filaments could be demonstrated in any 

 of the parts — recognisable as tissues— whether diseased or healthy. 



Specimen V. (Plate XXVII, Fig. 1). — This was a portion of the left foot of a native 

 which had been removed by a Chopart's amputation. There were several openings, 

 with elevated margins, both on the dorsal and plantar surfaces of the foot, out of which 

 dark granules could be picked. There was scarcely any thickening of the tissues of the 

 dorsum. 



The preparation was divided longitudinally into four segments. The appearance 

 presented by the first section is delineated at Plate XXVII : the scalpel is seen to have been 

 carried through the middle line of the bones of the second toe. The central portion 

 of the second metatarsal bone was, in great part, occupied by a dark-brown, spherical 

 mass about an inch in diameter, shaped something like a potato and presenting a slightly 

 radiating, finely striated appearance on section. It was moulded to the cavity in which 

 it was lodged, and its projecting nodules fitted accurately into adjoining cavities in the 

 surrounding tissues. The upper portion of the bone was curved, its tissue thickened 

 and hardened, and the lower portion fractured, a splinter being carried in front and 

 behind the dark globular mass, thus aiding in the formation of the cavity. The latter 

 communicates with both the dorsal and plantar surfaces of the foot by means of irregular 

 channels containing small black masses. The middle cuneiform bone was somewhat 

 softened below. 



There was another large cavity (visible in this line of section) situated somewhat 

 behind the one just described and above the plantar fascia. It also contained dark 

 tuberculated masses, and opened into several small cavities which communicated with 

 the surface on the sole of the foot. There were other cavities of smaller size. 



The second line of section was carried from behind forwards through the middle 

 of the cuboid bone, the base of the fourth metatarsal, and the line between the latter 

 bone and the third metatarsal. In this section the outer boundary of the large cavity 

 was distinguished ; it consisted of a delicate fibrous membrane just sufiicient to partition 

 off the cavity from another group of cavities and channels. This group appeared to 

 have originated with a cavity in the third metatarsal bone. The base of this bone was 

 intact at its articular surface, and for about a third of an inch forwards, but then became 



