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think through the connections involved. The reasoning is applied to larger-scale 'air in motion' and not just sea-breeze circulations. Furthermore, he begins with a clear look at how pressure differences across a pipe result in fluid flow. I believe that this approach is most fruitful. When students see the connections, perhaps via a practical investigation of fluid flow in pipes (investigating factors), the mathematical formulations make more sense. If this is linked with reference to the primary causedifferential heatingthen a fuller and more satisfymg explanation is achieved. References Crowder, R. B. (1995) The wonders of the weather. Australian Government Publishing Services, Canberra Fisher, B. W. (1996) The place of the study of the atmosphere in science and science education. MA dissertation,

(Cooper and Tainton 1968), so that the mean monthly temperatures of 4± 15 8C recorded here are well below optimum from this point of view. More sunshine and higher temperatures would increase annual potential evapotranspiration, but probably not sufficiently to match the present precipitation at all times of year.Drought periods are not a feature of the climate, but they can cause some damage. Simpson et al. (1987) provided evidence from mid-Wales of the ground cover of white clover (a key species for agricultural production) being appreciably reduced by shortage of moisture on steep slopes with soils which are too shallow to store much water.In view of the evidence in some parts of the world of global warming (e.g.

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