( 430 ) 
From all points of the wounded leaf consequently fine-granulated 
protoplasm flows together; it gathers immediately above the wound, 
replaces the chlorophyl-containing peripheral layer and currents and 
so causes the leaf locally to assume a white colour. 
When the white currents are observed microscopically, also in them 
a distinet streaming is observed, mostly in the two opposite directions 
at the same time or otherwise alternately, while a number of unco- 
loured granules are dragged along. But chlorophyll grains are entirely 
lacking. Yet after the lesion the quantity of plasm above the wound, 
‘white’ as well as “green”, increases, while in the top it diminishes, 
occasionally to such an extent even that the top becomes empty 
and dies. From this follows that the mass of plasm, conveyed down- 
ward by the currents is greater than the mass which is taken back 
upward, so that the resultant of the two motions is equivalent to a 
current going to the organic base. 
So the white currents behave exactly like the green ones; yet 
there is a difference between them, although only a quantitative one: 
while both groups of currents obey the same basipetal impulse, this 
latter appears to exert a somewhat greater influence on the white 
currents than on the green, for the green protoplasm is always 
observed to be pushed aside by the white. 
Now, when it had appeared that the white currents move towards 
the basal wound, the question arose whether they only strove to 
reach this wound or, perhaps not contented with this, would also 
try to occupy the very lowest (most basal) place near this wound. 
öxperiments showed this latter to be indeed the case. 
If a wound be made in a slanting direction with regard to the 
diameter of the leaf, the white plasm flows down along the wound 
and assembles in the sharp point; if the wound be V-shaped all 
gathers in the middle, while with a 4-shaped impediment the white 
currents flow off to the two points near the edges of the leaf. With 
these lesions the green currents behave exactly as the white ones, 
but again their terminal point is left a few millimetres behind that 
of the uncoloured currents. From this it appears more clearly still 
that these latter feel the basipetal impulse more strongly. 
Especially the current of uncoloured protoplasm which flows off 
along the wound is seen to follow a wavy course, since it consists 
of very short pieces of current, which go longitudinally downward, 
are then retlected by the wound and soon afterwards bend down 
again. Not unfrequently two currents run close to each other and 
in doing so cross each other repeatedly. The height of these waves 
is small, no more than '/, to */, mm. 
