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In some versions of Smalltalk, pool dictionaries are inherited; in other
versions they are not. Accordingly, if you want to be sure that the
variables in a dictionary are available by name, you should include an
explicit reference to that dictionary in every class for which there are
methods that need access to the dictionary. For example, you should
identify the CalorieGramRatios dictionary as a pool dictionary in
the Vegetable class if you wish to use values from that dictionary
in Vegetable methods, even if you have already identified the
CalorieGramRatios dictionary as a pool dictionary in the Food
class.