I 20 NOTES 



9. C. S. Minot, Age, Growth, and Death, p7~2bi, where the literature is also 



given. 



TO. V. E. Emmel, A study of the regeneration of tissues in the regenerating 

 crustacean limb. Amer. Journ. Anat., X, 109-158. 



1 1. As far as I know, H. Braus was the first to graft rudimentary extremities. 

 Compare Verh. Anat. Ges., XVIII and Anat. Anz., XXVI. His experi- 

 ments have been repeated and extended by W. H. Lewis and R. G. 

 Harrison. 



12. W. H. Lewis and Mrs. Lewis conjointly have made experiments upon 

 the in vitro cultures of embryonic tissue. Compare The Anatomical 

 Record, VI, 195 and 207. 



13. Carl Semper, Die Verwandtschaften der gegliederten Tiere, iii. Sem- 

 pers Arbeiten. Zool. Zootom. Institut Wiirzburg, Bd. Ill, 115. 



14. The text deals with the law of genetic restriction, which can be found 

 more definitely stated in my "Laboratory Text-book of Embryology," 

 2nd ed., p. 14. 



T5. E. A. Schafer, Life: its nature, origin and maintenance. (Presidential 

 Address before the British Association for the Advancement of Science, 

 Dundee, September, 1912). Longmans, Green & Co., London, 1912. 



1 6. W. Kleinenberg, The development of the earth-worm, Lumbricus trap- 

 ezoides. Quart. Journal of Microsc. Science, XIX, 206-244, 1879. 

 (Compare also, Zeitschr. wiss. Zool., XLIV, 1886.) 



17. E. B. Wilson, The germ bands of Lumbricus. Journ. of Morphology, 

 I, p. 183. 



1 8. J. T. Patterson, A preliminary report on the demonstration of poly- 

 embryonic development in the Armadillo. Anat. Anzeiger, XLI, 369- 

 381. (Cites also the earlier works of Newman and Patterson, et al.) 



19. Hans Driesch, Entwicklungsmechanische Studien I. Zeitschr. f. wiss. 

 Zoologie, LIII, 1 60. 



20. A. D. Mead, Biological Lectures at Woods Hole, Boston, 1898. 



21. F. A. Woods, Origin and Migration of the germ-cells in Acanthias. 

 American Journ. of Anat., I, 307. (The so-called "precocious segrega- 

 tion" of the sexual cells of fishes was first more exactly described by C. 

 H. Eigenmann.) 



22. B. M. Allen has determined the history of the sexual cells in four verte- 

 brate types. 



" 1911. Amia, Journal of Morphology, XXII, p. n. 

 1911. Lepidosteus Journal of Morphology, XXII, p. 2, 

 1907. Rana, Anat. Anzeiger, XXX, 339. 

 1906. Chrysemys, Anat. Anzeiger, XXIX, 217. 



23. R. W. Hegner, The origin and early history of the germ-cells in some 

 Chrysomelid beetles. Journal of Morphology, XX, 231-296, 4 Taf., 1909. 



