88 BIOLOGICAL CHEMISTRY 



A membrane round living cells cannot be a fundamental 

 requirement of the cells as amoeboid cells cannot have a 

 membrane. The surface condensations due to surface 

 tension phenomena are quite distinct from a membrane as 

 they are due to equilibrium conditions of the cell contents 

 in relation to their surrounding medium. That permanent 

 structures corresponding to membranes may be present in 

 some cells is not unlikely. 



When a membrane is present it is the servant, not the 

 master, of the cell. 



H. J. 

 A. B. 



GENERAL REFERENCES 



HAMBURGER : Osmotischer Druck und loncnlchre. Wiesbaden, 1902. 

 MACALLUM : Ergeb. d. Physiol., vol. n, pp. 602-658, 1911. 



