It is well known that a sum (coproduct) of a family {Xi : i ∈ I} of Priestley spaces is a compactification of their disjoint union, and that this compactification in turn can be organized into a union of pairwise disjoint order independent closed subspaces Xu, indexed by the ultrafilters u on the index set I. The nature of those subspaces Xu indexed by the free ultrafilters u is not yet fully u...

The behaviour of various formulas for évapotranspiration of grass in nonrestricted soil water conditions is considered. These are the expressions based on the Penman formula, i.e. "old" Penman, Penman-Monteith, Thorn-Oliver and the version recommended more recently by the FAO. Moreover, the Priestley-Taylor and the Makkink formulas are considered, which are radiation-based. Comparisons are made...

This is a book swarming with anachronism among which are a complaint about bad spelling allegedly common at the time (p. 9), the observations that Darwin's work reveals his potential to be the "first male feminist" (p. 167) (a particular obsession to which King-Hele often returns), that Darwin was "ahead of his time" in seizing on the rapid growth rates of cannabis which, ifmade into paper, mig...