The authors found that there was a distinct difference between young adults who later completed suicide & those who did not. The suicide-prone group were unduly susceptible to situations of stress. This group had high Habits of Nervous Tension (HNT) scores on the following 6 items: difficulty sleeping, urinary frequency, loss of appetite, urge to be alone, irritability, & a lack of urge to confide. Depressed feelings were not reported more frequently by the suicidal than by others. 14 ref. (NBB)