My manuscript "Monads and extensive quantities" is available at arXiv, http://arxiv.org/abs/1103.6009 It is shown how a commutative monad T on a cartesian closed category may be seen as a functor which to a space X associates a space of extensive quantities over X. A comparison, mapping T(X) into a double-dualization space S(X) of "Schwartz distributions" on X, is provided. The comparison is a morphism of monads. Anders Kock [For admin and other information see: http://www.mta.ca/~cat-dist/ ]