“…Slater (1943) in an analysis of the records of 2,000 neurotic soldiers found that 55.7 % of these men had one or more first-degree relatives-parent, sib, or child with definite neurotic illness, psychosis, epilepsy, or some form of psychopathy such as drink, shiftlessness, or violent habits. Ballard and Miller (1945), discussing psychiatric casualties in the R.A.F., found a positive family history in 60% of all cases of both sexes. In the battle exhaustion series information as to family mental history was given in 169 cases, of whom 71.6% had at least one first-degree relative with neurotic traits, psychopathy, psychosis, epilepsy, mental deficiency, or insanity.…”