The relation between intrathoracic lesions and bone and joint tuberculosis is a close one. Of 100 patients suffering from bone and joint tuberculosis, the chest films showed pulmonary involvement in 47 per cent. and intrathoracic lesions of varying degrees in 78 per cent. In view of such a high percentage, more attention should be paid to intrathoracic infections as the probable primary foci of so called surgical tuberculosis. A multiplicity of surgical lesions, however, does not necessarily bear any direct relationship to the extent of the existing pulmonary infection.