His fancy oscillates between constant extremes and ever-recurring contrasts.

Tyndall says again: "When a common pendulum oscillates, it tends to form a condensation in front and a rarefaction behind.

Again, in his Universal Geography, Reclus states that in the Armenian Highlands the thermometer oscillates between 13° F. and 112°F.

Spencer confesses that the entire universe oscillates between extremes of integration and disintegration.