 There were few books in his collection which he had not read, and he undertook the preparation of a full catalog of it.As far as he accomplished this task, it was the foundation of the "Ozerot Hayyim, Katalog der Michael'schen Bibliothek", Hamburg, 1848.Michael took an interest not only in Jewish literature, but in all the intellectual movements of the day, as is shown by the large number of contemporary books and leaflets found in his library.