THE TRANSLOCATION OF PROTOPLASM 105 



observed. When the flow is slow, the vacuoles remain fixed ; but, 

 when it is relatively rapid, the vacuoles are torn from their places 

 and are freely carried along in the stream. 



Fig. 59. — Fimetaria fimicola. Carrier a-lucida drawing of part of a mycelium in which 

 protoplasmic streaming was taking place. The protoplasm is finely granular 

 and vacuolated. The three hyphal systems a, b, and c are connected together 

 owing to hyphal fusions having been formed at o and j>. Protoplasm was 

 flowing rapidly in the direction shown by the arrows : acropetally through 

 three cells of a ; through the fusion passage-way at o ; basipetally through three 

 cells of a branch of b ; through the fusion passage-way at p ; and basipetally 

 through five cells of c. A few of the smaller vacuoles were moving with the 

 stream, but all the larger vacuoles and most of the smaller ones remained fixed 

 to the cell-walls. The hyphae d, e and / were connected together by hyphal 

 fusions between d and e and at 7, but no flow of protoplasm could be observed 

 within them. Magnification, 434. 



On first observing protoplasm streaming along a hypha. one 

 very naturally desires to know how the protoplasm passes from cell 



