On the existence of a head kidney in embryo chick, and on certain points in the development of the Müllerian duct / by F. M. Balfour and Adam Sedgwick. [S.l.], 
- PDF Titelblatt: Balfour: Head-Kidney in Embryo Chick.
- PDF On the EXISTENCE of a HEAD-KIDNEY in the EMBRYO CHICK, and on Certain Points in the DEVELOPMENT of the MÜLLERRIAN DUCT. By F. M. BALFOUR, M.A., Fellow of Trinity College, Cambridge; and ADAM SEDGWICK, B.A., Scholar of Trinity College, Camebridge. (With Plates I and II).
- PDF DESCRIPTION OF PLATES I, II.
- PDF Plates