Note 10 — LECTURE I. THE PHYSICAL ELEMENTS OF ETHNOGRAPHY.
Reading edition
More accurately, the pigment cells in man are in the deeper layer of the rete mucosum Malpighii. Cf. A. Kölliker, “Ueber die Entstehung des Pigments in den Oberhautgebilden,” in the Zeitschrift für wissensch. Zoölogie, Bd. XLV., s. 713 sq.