Experiment 1: Halfway between the wrist crest and the most prominent point of the metacarpopha-langeal joint of the thumb and 1.9 cm from the edge of the metacarpal bone. The depth of the probe under the skin surface was 0.43 cm; 1.35 cm of the needle was inserted
Experiment 2: In the medial aspect of the capsule of the first metatarsophalangeal joint, 0.53 cm be-neath the surface with 1.2 cm of the probe beneath the skin.
Experiment 3: In the thumb capsule, 0.46 cm below the skin with 1.5 cm of the needle inserted. Experiment 4: In the flexor hallucis brevis muscle, 1.2 cm below the skin with 2.7 cm of the needle in-serted. Each of the four subjects, healthy male students between the ages of 25 and 32, was treated in the