1913] nolmcs: Ectodcrmic Epithelium of Tadpoles 169 



6. Unfavorable conditions tend to mal^e the epithelial eells 

 assume a rounded form. Heat causes them to retract their 

 pseudopods and makes the strands of cells contract and break up 

 into masses. 



7. There is a limited amount of multiplication in the isolated 

 cells of the ectoderm. 



8. Amitotic divisions of the nucleus may occur in vitro, biit 

 they were not found to be followed by a cleavage of the cyto- 

 plasm. 



9. Isolated cells from young- embryos undergo comparatively 

 little differentiation, while cells that form a part of an organized 

 mass of tissue may continue to develop. 



BIBLIOGRAPHY 

 Barfurth, D. 



1891. Zur Regeneration tier Gewebe. Arch, niikr. Anat., 37, 406-191, 

 pi. 22. 

 Eycleshymer, a. C. 



1907. The closing of wounds in the larval Necturus. Am. Journ. Anat., 

 7, 317-325, 10 figs, in text. 

 Fraisse, p. 



1885. Die Regeneration von Geweben und Organen bei den Wirbeltieren 

 (T. Fischer, Cassel und Berlin), viii + 164, 3 pis. 

 Harrison, R. G. 



1910. The outgrowth of the nerve fiber as a mode of protoplasmic 



movement. Jour. Exp. Zool., 9, 787-848, pis. 1-3. 

 1912. The cultivation of tissues in extraneous media as a method of 

 morphogenic study. Anat. Rec, 6, 181-193. 

 Lewis, M. R. and Lewis, W. H. 



1912. Membrane formations from tissues transplanted into artificial 

 media. Anat. Rec. 6, 195-205, 4 pis. 

 LOEB, L. 



1902a. Ueber das Wachstum des Epithels. Arch. f. Ent.-mech., 13, 



487-506, pi. 20. 

 1902b. On the growth of epithelium in agar and blood serum in the 

 living body. Jour. Med. Res., 8, 109-115, pis. 9-11. 

 Oppel, A. 



1912a. Causal-morphologische Studien. IV Mitteilung. Arch. f. Ent.- 

 mech., 34, 133-167. pis. 9, 10. 

 1912b. Idem. V, Mitteilung, Ibid., 35, 371-456, pi. 8. 

 Peters, A. 



1885. Ueber die Regeneration des Epithels der Cornea. Inaug. Diss. 



Bonn. 

 1889. Ueber die Regeneration des Epithels der Cornea. Arch. mikr. 

 Anat., 33, 153-162. 



