"But listen! What is that ?" A hoarse rumble, like distant thunder, rose from the midst of the ice.
She sprang to her feet.

"Gregory, the river can't be breaking!" "No, no; surely not.

See, it is gone." The noise which had come from above had died away downstream.
"But there! There!" Another rumble, hoarser and more ominous than before, lifted itself and hushed the robins and the squirrels.

When abreast of them, it sounded like a railroad train on a distant trestle.

A third rumble, which approached a roar and was of greater duration, began from above and passed by.
"Oh, why don't they hurry!" The two specks had stopped, evidently in conversation.