70 PROTOPLASM AND THE AMCEBA. PROTOCOCCUS 



instance, its protoplasm streams away from a source 

 of heat when the temperature rises above 35° C. At 

 0° C. and at 35° C, or in the absence of sufi&cient dis- 



FiQ. 2. — Spreading of a drop of chloroform over a shellac-covered 

 glass fibre. Contact with the shellac lowers the surface tension 

 of the drop of chloroform, which spreads over and draws the 

 fibre into itself, removing the shellac. When the glass fibre is 

 bare the chloroform recovers its surface tension, reassumes the 

 spherical form and thus expels the fibre, which it cannot " wet." 

 The arrows in a, c and d show direction of movement of the 

 fibre; in b the movement of the chloroform; 5, shellac in the 

 chloroform. After Rhumbler. 



