The great island of Mindanao—second in size of the Philippine group—is still but little known to the average American and Filipino. Many years of struggle between the Spanish and the followers of Islam made the Christianized people painfully aware of the Moro in the south yet a detailed description of these people still remains to be written. The studies of Saleeby have provided a glimpse of their law, religion and history while various writers have told of the struggle to bring the southern islands under the rule of Spain. The writings of Christie have given us an idea of the pagan peoples adjacent to the Mohammedans. Garvan's intensive study of the Manobo of the Agusan river valley is a classic of description, while the papers of Benedict and the author furnish a rather full picture of the tribes along the Gulf of Davao.