The pineal gland of the mole (Talpa europaea L.)

Summary The pineal gland of the mole, a mammal which lives in permanent darkness, has been studied using fluorescence histochemistry. An extensive catecholaminergic innervation is demonstrated. A yellow formaldehyde-induced fluorescence, characteristic of indoleamines, was not observed. If formaldehyde vapour treatment was omitted in the procedure, numerous cells containing yellow-orange autofluorescent material could be shown. The nature and possible function of this material is discussed.This paper is dedicated in great admiration and appreciation to Prof. Dr. W. Bargmann on the occasion of his 70th birthday.