1904 - 5 .] Prof. Chrystal on Mathematical Theory of Seiches. 647 
phenomena as calculated for parabolic lakes. One of the objects 
I had in view is thus obtained : viz. — to control my previous 
results, some of which rested on long and intricate calculations, 
wherein the calculators might very well have made numerical 
errors. It also appears that the results formerly obtained are of a 
general character, and not bound up, as might be supposed, with 
special assumptions regarding the normal curve of a lake. This 
may possibly explain to some extent the unexpected accuracy 
with which the parabolic formulae have reproduced the natural 
phenomena as shown in the observations on Loch Treig and Loch 
Earn presently to be submitted to the Society. 
{Issued separately May 11 , 1905 .) 
