LASTLY, even Thunder, however terrible in its Appearance, and sometimes fatal in its Effects, is nevertheless very useful and beneficial upon the whole, for this likewise purifies the Air from sulphureous and oily Exhalations, and the Rains that fall with it fertilize the Earth exceedingly. It also moderates the Heat as Experience teaches us, for as it is always gloomy and sultry before Thunder, so it is afterwards generally cool and pleasant. These Remarks, though very short, may give the Reader an Opportunity of extending his Observations throughout all the Variations of Weather, and enable him to discern how useful and instructive a thing the Study of its Alterations may be, and how probable it is, that by proper Care and Attention, we may arrive at a much more useful, as well as a much more certain Knowledge in regard to the Weather, than hitherto has been attained. FINIS.