Usually there is little change in an individual's productions in the House-Tree-Person Drawing test from one administration of the test to another, but these interesting studies show that the responses in a patient before operation may be very different from those in the same patient after operation. In most cases the preoperative tests show signs of anxiety and regression which tend to disappear after the operative procedure. Direct allusions in the drawings to the patient's illness are infrequent, but indirect allusions to it are frequently present, tending to appear more often in the drawing of the house than in those of the tree or person. When the operation causes obvious mutilation, the postoperative drawings represent the change in a symbolic or defensive way rather than directly.