148 



CUNNINGHAM OX FLUCTUATIONS IN TCJRGESCENCE. 



yet it in no way affects the propagation of movements attending the establishment of 



ab 



drain on, or obstruct it 



CO 



of water to the tissues. Haberlandt assumes that, in cases 



spite of an interruption in the continuity of the bast, 

 the conveyance of the impulses across the hiatus is effected by the wood ; so that, in cases in which 

 i r pagation traverses several seared areas in an axis, he must assume that the impulses follow a com- 

 plicated zigzag course alternately in the bast tubes and the wood. Even apart from the phenomenon 

 of the purely centrifugal propagation of impulses in cases where heat is applied to points in the 



fact that propagation occurs readily, in spite of the presence of repeated 

 ty of tho system of turgid sieve-tubes, shows conclusively that the latter is 



course of mature axe? 

 interrupt ions in the c( 



in no sense a specific aj | .1 rat us for the conduction of the conditions which give rise to the occurrence 

 of movement*. 





W. J.— "Res No 6466J(c)-3?0-26 i 95. 



