THE KECOVERY FROM DEPRESSION 493 



Hebtwig, R. 1904 Ueber physiologische Degeneration bei Actinosphaerium 



eichhorni. Festschr. f. E. Haeckel., Jena, 303. 



1908 Ueber neue Probleme der Zellenlehre. Arch. f. Zellforsch., 



Bd. 1, p. 1. 

 Hodge, C. F. 1894 Changes in ganglion cells from birth to senile death. Jour. 



Phys., vol. 17, "p. 129. 

 Howard, W. T. 1908 A detailed study of the changes occurring in the physio- 

 logical degeneration of Actinosphaerium eichorni. Jour. Exper. Med., 



vol. 10, p. 207. 

 Howard, W. T. and Schultz, O. T. 1911 Studies in the biology of timior cells. 



Monographs of the Rockefeller Inst, for Med. Research, No. 2. 

 Johnston, J. B. 1916 Neutral red as a cell stain for the central nervous system. 



Anat. Rec, vol. 11, p. 297. 

 Kurtz, D. W. B., Jr. 1915 The neurocytology of surgical shock, III. Jour. 



Med. Research, vol. 32, p. 487. 

 Marinesco, G. 1909 La cellule nerveuse, t. 1. 

 MiNOT, C. S. 1890 On certain phenomena of growing old. Proc. Amer. Ass'n 



Adv. Sci., vol. 29. 



1895 Ueber die Vererbung und die Verjungung. Biol. Centralbl., Bd. 

 15. 



1908 Age, growth and death. 

 PoFOFF, M. 1907 Depression der Protozoenzelle und der Geschlechtzellen der 



Metazoen. Arch. f. Protistenk., Suppl. Festband f. R. Hertwig. 

 RosSLE, R. 1904 Der Pigmentierungsvorgang im Melanosarkom. Zeitschr. 



f. Krebsforsch, Bd. 2, p. 291. 

 Schultz, O. T. 1912 The formation of pigment by the dermal chromat- 



ophores. Jour. Med. Research, vol. 26, p. 65. 

 Verworn, M. 1891 Die physiologische Bedeutung des Zellkernes. Pfiiiger's 



Arch., Bd. 51. 



1896 Erregung und Lahmung. Verhandle. d. Ges. deutsch. Naturf. 

 u. Aerzte zu Frankfort a M., I Thiel, Bd. 73. Deutsch. Med. Woch., 

 Bd. 22, 640. 



