364 Bibliography 



HARDENS, A. 



1912. Enzymes and inhabitants. Sci. American, Suppl., Dec. 7, 



1912, p. 363. 

 HAHGITT, C. W. 



1900. A review of the problem of sex cells in the Hydromedusae. 



Proc. Am. Assn. Adv. Sci., v. 49, pp. 240-242. 

 HARMER, S. 



The Polyzoa; Cambridge Natural History, vol. II. London. 

 HARMS, W. 



1913. Experimentell erzeugte Metaplasien bei Rana fusca llos. 

 Zool. Anz., Bd. 42, pp. 49-55. 



HARRISON, R. G. 



1906. Observations on the living developing nerve fibers. Proc. 

 Soc. Exp. Biol. and Medicine, v. 4, pp. 140-143. 



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

 movement. Jour. Exp. Zool., v. 9, pp. 786-846. 



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

 of morphogenetic sjiudy. Anat. Rec., v. 6, pp. 181-193. 



HARTOG, R. 



1906. Protozoa, v. I., Cambridge Natural History. London. 

 HEIDENHAIN, M. 



1911. Plasma und Zelle. Jena. 

 HEINCKE, FR. 



1902-04. The occurrence and distribution of the eggs, larvae, and 

 various age-groups of the food fishes in the North Sea. Conseil 

 internat. pour 1'explor. de la mer, Rapp. et proc.-verb., 1-3, appen- 

 dix E, pp. 1-39. 



HEIXCKE, FR., and EHRENBAUM, E. 



1898. Eier und Larven von Fischen der deutschen Bucht. II. Die 

 Bestimmung der schwimmenden Fischeier und die Methodik der 

 Fimessungen. Wissenschaftliche Meeresuntersuchungen, neue Folge, 

 Bd. 3. 



HENOFRSOST, L. J. 



1913. The Fitness of the Environment. New York. 

 HERBST, C. 



1909. Vererbungsstudien VI. Die cytologischen Grundlagen der 

 Verschiebung der Vererbungsrichtung nach der mutter-lichen Seite. 

 Arch. f. Entw'mch., Bd. 27, pp. 266-308. 



HERT.TTZKA, A. 



1896. Sullo sviluppo di embrioni completi da blastomeri isolati di 

 uova di tritone (Molge cristata). Arch. f. Entw'mch., Bd. 4, pp. 

 624-658. 



HERTOGHE, E. 



1914. Some remarks on thyroid deficiency. Am. Medicine, v. 20, 

 p. 194. 



HERTAVIG, O. 



1893. Die Zelle und die Gewebe. Jena. 



1895. The Cell: Outlines of General Anatomy and Physiology 

 (Campbell trans.). London. 



1896. The Biological Problem of To-day: Preformation or epi- 

 genesis? The basis of a theory of organic development (Mitchell 

 trans.). London. 



