[158] Loeb, J., “Untersuchungen zur physiologischen Morphologie der Tiere.”

[159] Morgan, T. H., Regenera­tion, New York, 1901.

[160] Bardeen, C. R., Am. Jour. Physiol., 1901, v., 1; Arch. f. Entwcklngsmech., 1903, xvi., 1.

[161] Przibram, H., Arch. f. Entwcklngsmech., 1901, xi., 329.

[162] Child, C. M., Senescence and Rejuvenescence. Chicago, 1915.

[163] Loeb, J., Am. Jour. Physiol., 1900, iv., 60.

[164] The writer quotes this after Driesch.

[165] Driesch, H., Arch. f. Entwcklngsmech., 1902, xiv., 247.

[166] One author, Miss Thatcher, in trying to repeat these observa­tions, did not notice the total collapse of the tissues and concluded that my observa­tions must have been wrong. The writer is fairly certain that his observa­tions were correct.

[167] Not yet published.