From Bishop Daly

In the month of October, we traditionally honor Mary, and no devotion is as popular as the rosary. Historically, this has been one of the most loved practices in Catholic devotion, taking different forms throughout the centuries. The rosary that most of us are familiar with praying is known as the Dominican Rosary. As originally developed, it consists of three sets of five mysteries, with each mystery containing a decade (or set of 10) of Hail Mary prayers, totaling 150.