418 Proceedings of the Royal Society 
atmosphere, and by conduction and convection downward into 
the lower strata of the water. By the 15th October the loss down- 
wards has ceased, and the heat lost between that date and 15th 
November has escaped by the surface. 
Fig. 5.— Curves of Temperature in Tarbet Basin Fig. 4.— Curves of Temperature in 
Inversnaid, 1885 Luss Basin, 1885. 
