( 573 ) 
definite proof in favour of Godlewski. A small tree would, however, 
be sufficient for this. 
The method in which a living piece of wood is isolated between 
two dead portions is especially to be recommended. The portions 
to be killed should not, however, be heated above about' 60°, in 
order to spare the intermediate position (compare the experiment with 
the induction current). If possible a leafy branch should be left attached 
to the intermediate portion, for, otherwise it must soon die of hunger. 
Groningen , January 28 th 1910.. 
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