THE TRANSLOCATION OF PROTOPLASM 



1 39 



an injury to a hypha which resulted in the death of a cell and the 

 separation of living cells from one another was healed up. 



Two camera-lucida drawings illustrating the appearance of 

 certain hyphae a few hours after some of their cells had been killed 

 are reproduced in Fig. 72. In Fig. 72, A, a branched cell a b c was 



Fig. 72. — Pyronema confluens. Camera-lucida drawings showing the union of two 

 living parts of a mycelium brought about by the growth of hyphae through 

 cells killed by a mechanical operation. A : the branched cell a b c was killed 

 as a result of being touched and moved by a needle ; at the moment when the 

 cell a b c died, the septa a and b, which were previously plane, became convexly 

 extended into the lumen of the dead cell and their pores became blocked with 

 a plug. Two and a half hours later, as here shown, two hyphae had grown out 

 from the living cells o and p into the dead cell and had fused together at d. 

 B : the branched cell a b c and the adjacent unbranched cell c d were both 

 killed as a result of being touched and moved by a needle ; at the moment when 

 these two cells died, the septa a, b, and d bulged outwards from the living cells 

 p, q and o into the dead cells. Four and a half hours later, as here shown, the 

 living cell o through the septum d had sent out a hypha which had grown through 

 the dead cell c d, had pierced the septum c, had grown through the dead cell 

 a b c, and had united with the living cell p ; while the living cell q through the 

 septum b had sent out a hypha which had grown through the dead cell a b c, 

 had united with the living cell p, and had also united at e with the other new 

 hypha. Magnification, 446. 



killed, with the result that two intrahyphal hyphae grew out from 

 the septa, pushed the pore plugs aside, met in the middle of the 

 dead cell, and fused. In Fig. 72, B. the branched cell a b c and 

 the adjacent unbranched cell c d were both killed. Four and a half 

 hours later, as shown in the illustration, the living cell o through 

 the septum d had sent out an intrahyphal hypha which had grown 

 through the dead cell c d, had swollen out against and had pierced 

 the septum c, had grown through the dead cell a b c, and had united 

 with the living cell p, while the living cell q through the septum b 



