NOTES 121 



24. Oskar Hertwig, Beitrage zur Kenntnis der Bildung, Befruchtung und 

 Teilung des tierischen Eies. Morphol. Jahrb., I, III, and IV, 1875-1878. 



25. W. G. Moenkhaus, The development of hybrids between Fundulus 

 heteroclitus and Menidia notata. Amer. Journ. of Anal., Ill, 39-65, 1904. 



26. E. G. Conklin, Karyokinesis and cytokinesis, etc., of Crepidula and 

 other Gastropoda. Journ. Acad. Nat. Sciences, Philadelphia, XII, 1902. 



The organization and ceU lineage of the Ascidian egg. Journ. Acad. 

 Nat. Sciences, XIII, 1-119, 1905. (See p. 93 ff.) 



27. F. R. Lillie, Embryology of the Uniomidas. Journ. of Morphology, X, 

 1895. 



Differentiation without cleavage in the egg of the annelid Chaetop- 

 terus pergamentaceous. Arch, fur Entwicklungsmechanik, XIV, 1902. 



(The works of E. B. Wilson, Arch. f. Entwicklungsmechanik, XVI, and 

 Journal of Exp. Zoology, I, may also be compared. Further, the treatise 

 of Yatsu's Biol. Bulletin, VI.) 



28. E. Maupas, Recherches exp6rimentales sur la multiplication des In- 

 fusoir6s cilies. Arch. Zool. Experim., 1888. 



29. Calkins has caused several students to carry on investigations on the 

 life cycle of the Protozoa. The newest one of these is the investigation 

 of Miss J. E. Moody, which was published in the Journal of Morphology, 

 XXIII, Heft 3 (Sept., 1912), 349-408. Miss Moody cites the earlier 

 literature and presents a good discussion of "depression'' to the reader. 



30. H. S. Jennings, Assortative mating, variability, and inheritance of size 

 in the conjugation of Paramecium. Journ. Exp. Zool., XI, 1-134, 1911. 



31. C. M. Child, A study of senescence and rejuvenation based on experi- 

 ments with Planaria dorotocephala. Arch, fur Entwicklungsmechanik, 

 XXXI, S37-6r6, 1911. 



32. E. G. Conklin, Cell size and nuclear size. Journ. Exp. Zool., XII, 

 1-98, 1912. 



Body size and cell size. Journ. of Morph., XXIII, 159-188, 1912. 

 2,^. C. S. Minot, Senescence and rejuvenation, ist paper. On the weight 

 • of guinea-pigs. Journ. of Physiol., XLl, gy-iSi- 



The results and further conclusions, as well as justification, may be 

 found in "The Problem of Age, Growth, and Death," which appeared 

 in 1908. 



34. C. A. Herter, Popular Science Monthly, LXXIV, 31 (Jan., 1909). 



35. M. Miihlmann, Das Altern und der physiologische Tod. Samml. anat.- 

 physiol. Vortrdge (Gaupp u. Nagel), Heft XI, Jena, 1910. 



The earlier works of the author are cited. The criticism of Minot 

 may be found on p. 22. Minot's criticism of Miihlmann appears on p. 

 28 of the book "Age, Growth and Death." 



