4. One has pictured a vessel, with streamers unfurled,
Another is making a map of the world;
A third has a problem in fractions to solve,
A fourth is explaining how planets revolve;
While a young physiologist, skilled in the art,
Is sketching the muscles, the lungs, and the heart.
5. In the midst of this bustle the school-master stands,
And, lo! he's a crayon in each of his hands;
And the chalk in his hand has a magical power:
A teacher might reason and talk by the hour,