The bulk of this poem, very interesting in its way, is Browning's exposition of his own belief, not an imaginative representation of what St.John actually would have said.

It does not therefore come into my subject.

What does come into it is the extraordinary naturalness and vitality of the description given by John's disciple of the place where they were, and the fate of his companions.

This is invented in Browning's most excellent way.

It could not be better done.
The next poem is the _Epistle of Karshish, the Arab Physician_, to his master, concerning his strange medical experience.