The Author Of The System Adopted By Gregory Was Aloysius Lilius, Or Luigi Lilioghiraldi, A Learned Astronomer And Physician Of Naples, Who Died, However, Before Its Introduction; But The Individual Who Most Contributed To Give The Ecclesiastical Calendar Its Present Form, And Who Was Charged With All The Calculations Necessary For Its Verification, Was Clavius, By Whom It Was Completely Developed And Explained In A Great Folio Treatise Of 800 Pages, Published In 1603, The Title Of Which Is Given At The End Of This Article.
Among the charitable institutions are Blessing Hospital (1875), St Mary's Hospital (1867; in charge of the Sisters of the Poor of St Francis), the Woodland Home for Orphans and Friendless (1853), St Aloysius Orphans' Home (1865), and several homes for the aged and infirm.
It is the seat of the Montana Wesleyan University (Methodist Episcopal), founded in 1890; St Aloysius College and St Vincent's Academy (Roman Catholic); and has a public library with about 35,000 volumes, the Montana state library with about 40,000 volumes, and the state law library with about 24,000 volumes.
Among the educational institutions are the German American school, Hasbrouck institute, St Aloysius academy (Roman Catholic) and St Peter's college (Roman Catholic); and there are good public schools.
Hagiology entered on a new development with the publication of the Sanctorum priscorum patrum vitae (Venice and Rome, 1551-1560) of Aloysius Lipomanus (Lippomano), bishop of Verona.