660 THE AMERICAN NATURALIST. 
shore. This wave, in turn, would be reflected from the shore 
and reénforce the third wave. 
The study of seiches in this country is just beginning to 
receive attention, and there are some questions about them 
that we will have to leave unanswered until more definite 
knowledge is obtained concerning them. 
After we have pointed out as many causes as we are able 
we will probably find ourselves repeating the words of G. H. 
Darwin, when he writes: “Although it is possible to indicate 
causes competent to produce seiches, we cannot as yet point 
out the particular cause for any individual seiche. The com- 
plication of causes is so great that this degree of uncertainty 
will probably never be entirely removed.” 
ANN ARBOR, MICH. 
