There are probably few mathematicians who have not dreamed of an interesting problem, observes Professor Dugald Stewart.

In these vivid scenes we are often so completely converted into spectators, that a great poetical contemporary of our country thinks that even his dreams should not pass away unnoticed, and keeps what he calls a register of nocturnals.

TASSO has recorded some of his poetical dreams, which were often disturbed by waking himself in repeating a verse aloud.

"This night I awaked with this verse in my mouth-- "_E i duo che manda il nero adusto suolo_.
The two, the _dark_ and burning soil has sent." He discovered that the epithet _black_ was not suitable; "I again fell asleep, and in a dream I read in Strabo that the sand of Ethiopia and Arabia is extremely _white_, and this morning I have found the place.

You see what learned dreams I have." But incidents of this nature are not peculiar to this great bard.