Let us try to trace this out in detail.
To begin with, we may suppose that the image of the procession occupies the dreamer's mind.

From quite another source the image of the lady enters consciousness, bringing with it that of her deceased husband and of the friend who has recently been talking about her.

These new elements adapt themselves to the scene, partly by the passive mechanism of associative dispositions, and partly, perhaps, by the activity of voluntary selection.

Thus, the idea of the lady's husband would naturally recall the fact of his death, and this would fall in with the pre-existing scene under the form of the idea that he is the person who is now being buried.

The next step is very interesting.