The Study of Human Heredity. 



In studies on insanity it is suggested that qualifying lower case 

 letters, used singly or in combination, should, whenever possible, be 

 added to the letter I, e. g. : 



a alcoholic insanity, 



d dementia prsecox, 



g general paralysis of the insane, 



m manic depressive insanity, 



p paranoia, 



s senile dementia, 



t traumatic insanity. 



On the pedigree chart, b stands for born ; m, for married ; t or d, 

 for dead or died ; t (or d) inf. means died at or before two years of 

 age; t (d) young, means died before the age when the trait normally 

 develops or is detectable; e. g., with feeble-mindedness before six 

 years ; with epilepsy before fourteen ; with insanity before twenty. 



In case other traits or causes of death are given on the chart they 

 may be abbreviated as follows : 



bd Bright's disease, 

 ca cancer, 

 cb childbirth, 

 ch chorea, 

 cr cripple, 

 df deformed, 

 dp dementia praecox, 

 dt delirium tremens, 

 dy dropsy, 

 ec eccentricity, 

 en encephalitis, 

 go goitre, 



gp general paralysis of the in- 

 sane, 

 hy hysteria, 



id ill defined organic disease, 

 kd kidney disease, 



la locomotor ataxia, 

 md manic depressive insanity. 



np neuropathic condition, 

 obs obesity, 



pa paranoia, 



pn pneumonia, 



sh shiftlessness, 

 sni simple meningitis, 



sb softening of the brain, 

 SCO scoliosis, 



sd senile dementia, 



su suicide, 



va varices, varicose veins, 



ve vertigo, 

 X unknown, 

 f implies doubt. 



When preceded by a t (or d) the term indicates the cause of death. 



In making the charts rubber stamps may be used to advantage. 



Standard sizes of these may be obtained from Lewis F. Walton, 12 



