170 COMPARATIVE PHYSIOLOGY OF THE BRAIN 



movement or progressive movement produced by 

 them, we must again refer to the simple segmerital 

 relations of the first embryonic formation that re- 

 mains better preserved in the central nervous system 

 than in the muscles. The problem with which we have 

 to deal here is ultimately a problem of embryology. 



BIBLIOGRAPHY. 



1. LOEB, J., and WALTER E. GARREY. Zur Theorie des Gal- 

 vanotropismus. II. Mittheilung. Versuche an Wirbelthieren. Pflii- 

 gers Archiv, Bd. Ixv., 1896. 



2. LOEB, J., and S. S. MAXWELL. Zur Theorie des Galvanotro- 

 pismus. Pflugers Archiv, Bd. Ixiii., 1896. 



3. FLOURENS, P. Fonctions du Systtme nerveux. Paris, 1842. 



