Total classified 48.5 External ear 0.6 Impacted cerumen 0.2 Foreign bodies 0.1 Miscellaneous 0.3 Middle ear 27.2 Suppurative 19.6 Scarlet fever 11.1 Disease of ear 3.6 Measles 2.5 Influenza 0.7 Other causes 1.7 Non-suppurative 7.6 Catarrh 3.6 Colds 1.6 Other causes 2.4 Internal ear 20.7 Labyrinth 1.8 Malarial fever 1.2 Other causes 0.6 Nerves 18.5 Meningitis 9.6 Brain fever 4.7 Typhoid fever 2.4 Other causes 1.8 Brain center 0.3 Miscellaneous 0.1 Unclassified 45.3 Congenital 33.7 Old age 0.3 Military service 1.0 Falls and blows 2.8 Sickness 2.7 Fever 2.0 Hereditary 0.3 Miscellaneous 2.5 Unknown 6.2 In fairly approximate agreement with the returns of the census, are the records of the special schools for the deaf in respect to the causes of deafness in their pupils, with information also as to the amount from the minor diseases. The following table will give the causes by specific diseases, as found in one school, the Pennsylvania Institution, for two years:[21] CAUSES OF DEAFNESS OF PUPILS IN PENNSYLVANIA INSTITUTION 1906 1907 PER CENT PER CENT