Lifting his shaggy head beside the fire,
When guests like these had gone, "Master, beware!"
And Tycho of the frank blue eyes would laugh.
Even when he found Witichius playing him false
His anger, like a momentary breeze,
Died on the dreaming deep; for Tycho Brahe
Turned to a nobler riddle,--"Have you thought,"
He asked his young disciples, "how the sea
Is moved to that strange rhythm we call the tides?
He that can answer this shall have his name
Honoured among the bearers of the torch
While Pegasus flies above Uraniborg.
I was delayed three hours or more to-day
By the neap-tide. The fishermen on the coast
Are never wrong. They time it by the moon.
_Post hoc_, perhaps, not _propter hoc_; and yet
Through all the changes of the sky and sea
That old white clock of ours with the battered face
Does seem infallible.
There's a love-song too,
The sailors on the coast of Sweden sing,
I have often pondered it. Your courtly poets
Upbraid the inconstant moon. But these men know
The moon and sea are lovers, and they move
In a most constant measure. Hear the words
And tell me, if you can, what silver chains
Bind them together." Then, in a voice as low
And rhythmical as the sea, he spoke that song:

THE SHEPHERDESS OF THE SEA