The data on Pueblo women published by Miss Aberle in the preceding paper reminded me of a series of records given me years ago by an old physician in the Indian Service, Doctor Walker, and which I was reserving for some future report on the subject. Doctor Walker had spent many years among the large tribe of the Oglala Sioux, on the Pine Ridge Reservation, South Dakota, learned their language, and, being scientifically inclined, made various careful medical inquiries about the conditions among the people. When I visited the tribe in 1908, in connection with studies on tuberculosis, I became interested in the doctor's inquiries, found him meticulously careful, and subsequently obtained his individual records for eventual elaboration and use. They are presented here both in detail and in an abstract.
These data were given to Jas. R. Walker, M.D., by the Oglala Sioux Indian women named therein, on the Pine Ridge Reservation, from July, 1897, to July, 1908. They include only healthy women who married young and lived continuously in a married state during the child-bearing period.
Some of these women gave approximate dates, but they are probably near enough correct to be reliable. There were many dated events by which some such statements could be checked. Many of the women knew the dates well, or could ascertain them with the help of close relatives.
I n former times, when one of these Indians wished to change the marriage relation, he, or she, simply quitted one and lived with another, with no interval of time. Some of these women changed husbands in this manner. Some lived 81