A physician is confined in a different way, but more closely than a teacher: he can never leave home: he knows generally no vacation, and nothing but accidental rest.
The lawyer is confined as much.

It is true there are not throughout the year exact hours which he must keep, but, considering the imperious demands of his business, his personal liberty is probably restrained as much by it as that of the teacher.

So with all the other professions.
Although the nature of the confinement may vary, it amounts to about the same in all.

On the other hand, the teacher enjoys, in reference to this subject of confinement, an advantage which scarcely any other class of men does or can enjoy.

I mean vacations.