Fig 1: Ernest Everett Just, https://hdl.handle.net/1912/16272

Fig 2: From Just, 1939.

References:

Byrnes, W.M., 2009. Ernest Everett Just, Johannes Holtfreter, and the origin of certain concepts in embryo morphogenesis. Molecular Reproduction and Development: Incorporating Gamete Research, 76(10), pp.912-921:

“This paper, after briefly describing the life and scientific contributions of Just, argues that his work and ideas strongly influenced two of the concepts for which Holtfreter is best known: tissue affinity and autoneuralization (or autoinduction).”

Just, E.E., 1939. The biology of the cell surface.

Nabrit, S.M., 1946. Phylon Profile, VIII: Ernest E. Just. Phylon (1940-1956), 7(2), pp.121-125.