Out of an airplane 2,200 ft. over Dayton last month tumbled a bulky Army doctor with a parachute rip cord in his hand, a determined gleam in his eye, and, since it was his first jump, a tremor of 'fear in his heart. For 1,200 ft. he plummeted end over end at 119 m.p.h. Then he pulled his rip cord, jerked upright as the parachute opened, floated serenely to earth, well pleased because he had just made the first scientific analysis of the "subjective mental and physical reactions to a free fall in...
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