38 Gen. Sub. 
I. GENERAL SUBJECTS. 
[ 1904 ] 
647. [Morgan, T. H.] The dispensibility of the constant action of gravity 
and of a centrifugal force in the development of the toad’s egg. 
Anat. Anz. xxv, pp. 94-96. 
648. . The control of heteromorphosis in Planaria maculata. Arch. 
Entwickmech. xvii, pp. 683-695, 1 fig. 
649. — — . Germ-layers and regeneration. Op. cit. xviii, pp. 262-264. 
650. . The relation between normal and abnormal development of 
the embryo of the frog (iii), as determined by some abnormal forms 
of development. T. c. pp. 507-534, pis. xxxi, xxxii. 
651. . An analysis of the phenomena of organic ‘ polarity.’ Science 
xx, pp. 742-748. 
652. . Polarity and axial heteromorphosis. Amer. Natural, xxxviii, 
pp. 502-505. 
653. * . Evolution and adaptation. New York, 1903, 470 pp. 
Review by Bashford Dean, Science xix, pp. 221-224 ; and by W. E. C., 
Amer. Natural, xxxviii, pp. 398, 399. 
654. * . Die Entwickelung des Froscheies. Eine Einleitung in die 
experimentelle Embryologie. Ubersetzt von B. Solger. Leipzig, 
1904, 8vo, xv + 291 pp. 
655. & Dimon, Abigail C. An examination of the problems of 
physiological “ polarity ” and of electrical polarity in the earthworm. 
J. exp. Zool. i, pp. 331-347. 
656. & Schiedt, Alice E. Regeneration in the Planarian Phagocata 
gracilis. Biol Bull, vii, pp. 160-165. 
657. & Stevens, N. M. Experiments on polarity in Tubularia. 
J. exp. Zool. i, pp. 559-591. 
658. & Torelle, Ellen. The relation between normal and ab- 
normal development (iv), as determined by Roux’s experiment of 
injuring the first formed blastomeres of the frog’s egg. Arch. 
Entwickmech. xviii, pp. 535-554, pi. xxxiii. 
659. Moroff, T. Uber die Entwicklung der Kiemen bei Fischen. Arch, 
mikr. Anat. lxiv, pp. 189-213, pis. xi, xii. 
660. Moser, Fanny. Beitraige zur vergleichenden Entwicklungsgeschichto 
der Schwimmblase. Arch. mikr. Anat. lxiii, pp. 532-574, pis. xxii-xxv. 
661. Moszkowski, M. O. Maas. Einfuhrung in die experimentelle Ent- 
wickelungsgeschichte (Entwickelungsmechanik). Biol. Centrbl. xxiv, 
pp. 318-320. 
Review of Maas, (476) Gen. Sub. Zool. Rec. 1903. 
662. Mott, F. W., Halliburton, W. D. & Edmunds, A. Regeneration 
of Nerves. (Preliminary Communication.) J. Physiol, xxxi, pp. 
vii-xii. 
663. *Muller, R. Jahrbuch der landwirtschaftlichen Pflanzen- und 
Tierzfichtung. Sammelbericht fiber die Leistungen in der Zucht- 
ungskunde und ihren Grenzgebieten. Herausg. von Prof. Dr Robert 
Muller. i. Die Leistungen des Jahres 1903. Stuttgart, 1904. 
414 S. 
664. Munson, J. P. Researches on the oogenesis of the tortoise, 
Clemmys marmorata. Amer. J. Anat. iii, pp. 311-347, 7 pis. 
665. Murbach, L. The static function in Gonionemus. Biol. Bull, vi, 
pp. 317, 318. 
