So he decides to write a treatise on it.

There the defendants had engaged the plaintiff to write a treatise for a periodical publication.

Back in 1936 he had written a treatise that envisaged a machine capable of doing complex calculations by turning them into elementary mechanical tasks.

He also was a lutenist and mentioned having written a treatise on music, though this was never published.

He wrote a treatise on martial arts, published in 1711.