668 



Professor George Chrystal 

 Scottish Lakes. 



[May 17, 



[Lantern slides of typical limnogTams from various Scottish lakes 

 were then shown. Two of these are given in Figs. 6 and 7.] 



I now show joa a map of Loch Earn (Fig. <s), on which are laid 

 down the positions of the uninode, binodes and trinodes, as calculated 



■^^^'^-'■^^^^'^'''^^vmm\hKr\!\!^^ 



Fig. 6. 



by Mr. Wedderburn and myself in 1905. You will notice that the 

 uninode and middle trinode are not coincident, as they would ])e in a 

 lake of uniform breadth and depth, and that the eastern binode and 

 trinode are nearer the shallower end than ^ and ^ respectively of its 

 whole length. 



