Physical Aspects of Protoplasmic Streaming 



205 



The pressure difference between compartment A and compart- 

 ment B is ascertained by a water manometer M of 50 cm. in height. 



Compartment A and compartment B will, hereafter, be referred 

 to as A and B for the sake of simplicity. 



Ill EFFECT OF PRESSURE DIFFERENCE ON PROTOPLASMIC 



STREAMING 



' When there is no pressure difference between A and B, streammg 

 takes place normally along the connecting strand of the prepared 



W^ 



Fig. 5. Diagram showing the arrangement of the whole system consisting of 

 the double chamber having two compartments, A and B, rubber aspirator, As, 

 controlled by screw, S, manometer, M, and stop cock, SC. Agar wall is shaded. 

 Protoplasm in A and B is designated a and h, respectively. 



Plasmodium which penetrates the agar wall, showing the usual 

 rhythmic reversal in direction of flow. But when the two com- 

 partments are subjected to a pressure difference, the velocity of 

 the streaming, which otherwise would proceed normally, is modi- 

 fied in accordance with the extent and direction of the pressure 

 difference established (Kamiya, 1940) . 



Let us suppose the protoplasm to be flowing from a to b (Fig. 5) . 

 If a slightly lower pressure causing suction is applied to B, then the 

 flow of the protoplasm along the connecting strand from a into b is 

 accelerated. 



