You may listen to this episode here:
Image of Descriptive Statement of male and female prospective students from the agent at Pine Ridge, M234, Reel 724, Frame 947. (Whole letter is frames 94-947, I think.) Red Cloud Agency, 1871-1880: 1879 (A6-M2227) (archives.gov). This is the document Jim talks about with the differing number of students being sent from Pine Ridge.
Sources referenced:
Letter from Richard Henry Pratt to Ezra H. Hayt, November 13, 1879.
Richard Henry Pratt’s memoir, Battlefield and Classroom: Four Decades with the American Indian, 1867-1904 (2004).
Luther Standing Bear, My People The Sioux (2017)
Example of contrasting statements about why there were fewer female students than male students:
Excerpt from Pratt’s letter to Hayt, November 13, 1879. (Note this is the example I read in the episode.)
Excerpt from article “Arrival of the Indians,” Carlisle Weekly Herald, October 5, 1879, p. 3
And, just in case you’d like to learn more, here’s some info about the disease scrofula.