Meanings of long dissertation in English

One freshman, to start conversation, went into a long dissertation on tea.

What can be more defective and unsatisfactory than his long dissertation upon tea?

Each affords matter enough for a long dissertation on New England and human character.

Whereupon the baby burst into a long dissertation on a present he had lately received.

He then went into a long dissertation on the astonishing accomplishments of Artful Dick Cronk.

Do you remember his long dissertation on the law-abiding criminals of this little old country?

A certain visionary crank once intruded into his study and bored him with a long dissertation.

Dr. Kuyper favors us with a long dissertation upon the various laws of naturalisation existing throughout the world.

For she now went into a long dissertation upon the discomfort of Torre Sansevero, where she nearly froze to death.

After a long dissertation on the meaning of the word zal, Liszt, from whose book this quotation is taken, proceeds thus:-

But...I have received comments from a few people that one, long dissertation document provides a much more in-depth study of the particular subject.

Well if that's the way it's always been, then why the long dissertation on the disservice being done to dragons by story-telling humans?

Here Amelia entered into a long dissertation on friendship, in which she pointed several times directly at the colonel as the hero of her tale.

There were many long dissertations where short articles would have been more to the purpose.

There were long dissertations written in long-hand; some were political and others dealt with the history of art.

"I could give a long dissertation about facial classifications, and softened features, but I won't."