[103] But nevertheless albumen is not to be replaced altogether in vertebrates by fat or carbohydrate; it probably serves some special function besides combustion, even in the adult.
[104] Arch. Entw. Mech. 18, 1904.
[105] To a physiological friend of mine I owe the suggestion that it is the permanently functioning tissues which stand hunger better than the others, at least if the sexual cells might be regarded as capable of a sécrétion interne in all cases. Then the adaptations in the state of hunger might be said to be reduced in some degree to “functional adaptation.” But it must remain an open question, it seems to me, whether such a view may indeed hold in the face of the facts observed in Planaria and infusorians.
[106] In all cases where fungi of the same species are able to live on different hosts, that is, to penetrate membranes of a different chemical character, a similar objection as to the “secondary” type of such a regulation may be made.
[107] The discovery of Weinland that adult dogs are able to produce “lactase” in their pancreas, whenever they are fed, quite abnormally, with milk-sugar, has recently been said to be vitiated by an analytical mistake.
[108] Compare the excellent review of the subject by Bayliss and Starling in the Ergebnisse der Physiologie, 5, 1906, p. 664. The reader who misses here an analysis of the brilliant discoveries of Pawlow and his followers, relating to so-called “psychical and associative secretion,” will find these facts dealt with in another section of the book. These facts, indeed, would prove vitalism, it seems to me.
[109] It would be a true secondary metabolic regulation, if after the extirpation of one gland another different one were to assume its function. Nothing is known in this respect except a few rather doubtful observations about the interchange of functions between thymus and thyroid, except also the fact that the so-called lymph-glands increase in size after the extirpation of the spleen. Even here, of course, a sort of “restitution” would be included in adaptation proper.
[110] A good review is given by E. Fromm, Die chemischen Schutzmittel des Tierkörpers bei Vergiftungen, Strassburg, 1903.
[111] Davenport, Arch. Entw. Mech. 2, 1895–1896, and Hausmann, Pflüger’s Arch. 113, 1906.
[112] Leçons sur la pathologie comparée de l’inflammation, Paris, 1902.