WHICH FELL IN ORKNEY. 199 



For the same reason, I have considered it unnecessary to ad- 

 vert to any of the hypotheses which have been suggested by 

 philosophers, in order to account for such hail showers ; for the 

 sudden coalescing of the watery vesicles, and their almost si- 

 multaneous conversion into ice. 



On the accompanying little Map, Plate XII., traced from 

 Murdoch Mackenzie's General Chart of the Orkney Islands, 

 the track of the hail-shower is pretty accurately laid down, 

 and its very local nature is thus exhibited in a more striking 

 manner. 



XIII. 



