This illustration by Millicent Sowerby accompanies the poem Young Night Thought in the book A Child's Garden of Verses by Robert Louis Stevenson. The edition was published in 1908 by Chatto & Windus. 
 
Young Night Thought
All night long and every night,
When my mama puts out the light,
I see the people marching by,
As plain as day, before my eye.
 
Armies and emperors and kings,
All carrying different kinds of things,
And marching in so grand a way,
You never saw the like by day.
 
So fine a show was never seen
At the great circus on the green;
For every kind of beast and man
Is marching in that caravan.
 
At first they move a little slow,
But still the faster on they go,
And still beside them close I keep
Until we reach the town of Sleep.