(Mr. Pirie Watson's case--Radiogram by Dr. Hope Fowler.)]
The treatment varies with the conditions present, and must include
measures directed to the lesion from which the sinus has originated. The
extent and direction of any given sinus may be demonstrated by the use
of the probe, or, more accurately, by injecting the sinus with a paste
consisting of white vaseline containing 10 to 30 per cent. of bismuth
subcarbonate, and following its track with the X-rays (Fig. 35).