206 PRINCIPLES OF GENERAL PHYSIOLOGY 



pressure is equal to that of the surrounding solution. If this is impossible, the cell 

 will be destroyed. In any case, the concentration or dilution of the contents will 



FIG. 59. PORTRAIT OF SYDNEY HINDER. 



(From the Obituary Notice in Proc. R.8., 84s. ) 



seriously impair their functional activity. These remarks apply especially to animal 

 cells and it is in the investigation of these that the necessity for solutions of equal 

 osmotic pressure to themselves is met with. It is often required to replace the 

 blood or other solution with which the cells are normally in contact by some artificial 



