The one-dimensional channel equations are integrated numerically to determine the periods and structures of the lowest three longitudinal modes of free oscillations of the Bay of Fundy. It is found that the period of the lowest mode is 9.047 hr rather than somewhere in the vicinity of the M2 tidal period of 12.42 hr, as has been supposed hitherto. This estimate of the free period is obtained without considering the effects of rotation and friction, but an approximate treatment of these effects shows that their effect on the period is very small — rotation tends to decrease the period by less than 3% and friction tends to increase it by 1% at the most. The periods of the second and third modes are found to be 5.383 and 3.475 hr. The modal structures and their modification produced by rotational effects are presented.