Originally it was founded as a rival to that of the Ptolemies.

It was added to the collection in the Serapion.
SCIENTIFIC SCHOOL OF THE MUSEUM.

It remains now to describe briefly the philosophical basis of the Museum, and some of its contributions to the stock of human knowledge.
In memory of the illustrious founder of this most noble institution--an institution which antiquity delighted to call "The divine school of Alexandria"-- we must mention in the first rank his "History of the Campaigns of Alexander." Great as a soldier and as a sovereign, Ptolemy Soter added to his glory by being an author.

Time, which has not been able to destroy the memory of our obligations to him, has dealt unjustly by his work.

It is not now extant.
As might be expected from the friendship that existed between Alexander, Ptolemy, and Aristotle, the Aristotelian philosophy was the intellectual corner-stone on which the Museum rested.