Of specuativ   interest in this connection is the fact that ruffed 
gwouse, which probaly shsares the hare cycle or at least has a cycle of 
similar length, m   also have a similar turnover period, for pheAsants 
do(31b) and this period sem widely prevalent a       a111        birds 
(,p. 9) 
To postulate a connection between prolonged depression in cyclic 
species and turover period of cours fails to account for the possible 
mchanism involved. The future search for mechanismshould, hover, 
be consideraly   arowed by the recent pronnceme t of Elton and Nicholson

to the effect that the Drevailing unson of flutuation between species