266 
Walter Stiles and Ingvar Jorgensen. 
Whereas it has been generally supposed that the seat of 
antagonistic ion action is the plasma-membrane, Hansteen Cranner, 
in a recent paper (7), puts forward the opinion that the cell wall 
plays an active part in the interchange of substances between the 
living cell and its surroundings. This author produces evidence to 
show that the cell wall of actively growing cells contains lipoid 
substances as well as cellulose and pectin, and that the cell wall 
must be considered as of much greater importance in the vital 
functions of the cell than has hitherto been supposed. A discussion 
of this theory lies outside the scope of the present paper. It must 
be left for future work to localise definitely the actual part which 
the various membranes surrounding the protoplast actually play in 
the phenomena of antagonism. 
The University, 
Leeds. 
June 8th, 1914. 
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