far in the
lead, with many cases also from brain fever, disease of middle ear,
measles, and typhoid fever. From five to ten scarlet fever alone
outdistances all other diseases, followed in order by meningitis, brain
fever and typhoid fever. From ten to fifteen the main causes are
meningitis, scarlet fever, brain fever, and catarrh; from fifteen to
twenty catarrh and meningitis; from twenty to forty catarrh, colds and
typhoid fever; and from forty on, catarrh.

The following table[20] will show in detail the several causes of
deafness and their respective percentages.

CAUSES OF DEAFNESS

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 Pennsy