ABSTRACT
In glossematics, the material aspect of the linguistic system (e.g. sound waves, characters of a script); substance refers to the expression plane as well as to the content plane ( expression plane vs content plane): the substance of the expression plane is phonetic events (individual unclassified sounds), the substance of the content plane is the set of unordered thoughts and concepts that are differently structured from language to language by the form (see Hjelmslev 1943: ch. 9).
