In 1854 a newly-married couple moved into a substantial wooden house in the country in Sweden. During the years 1855 to 1865 seven children were born, all growing to maturity without any noteworthy disturbances on account of sickness. The father died in 1896, 88 years old, and was succeeded in the management of the estate by a son, born in 1861. This son married in 1897, but the wife died from eclampsia one year later. In 1901 he married again, and in 1904 the family consisted of husband, wife, two small children, the husband's mother, 79 years old, two maids and a manservant.
At this point Dr. Jundell, from whose report1 these details are taken, made an extended investigation of the family record as to sickness since 1854, of the premises, and of the living members of the family because of the continued occurrence during all these years of