The following tables give the percentages of cases of deafness in pupils from the important diseases as found in six schools in successive years: in the New York Institution in the total annual attendance from 1899 to 1912; in the Michigan School in the total biennial attendance from 1883 to 1912; in the Pennsylvania Institution in the number of new pupils admitted quadriennially from 1843 to 1912; in the Western Pennsylvania Institution in the number admitted biennially from 1887 to 1912; in the Maryland School in the number admitted biennially from 1884 to 1911; and in the Wisconsin School in the number admitted biennially from 1880 to 1908. I. CAUSES OF DEAFNESS IN NEW YORK INSTITUTION FROM 1899 TO 1912 |1899|1900|1901|1902|1903|1904|1905|1906|1907|1908|1909 +----+----+----+----+----+----+----+----+----+----+---- Total Number | 466| 476| 481| 477| 464| 503| 508| 510| 543| 555| 565 +----+----+----+----+----+----+----+----+----+----+---- Congenital |36.0|27.1|26.8|40.9|36.2|41.1|46.2|31.8|33.3|34.4|34.9 Scarlet Fever |11.4|10.1| 8.9| 7.1| 6.5| 6.9| 6.5| 4.9| 5.3| 5.0| 5.7 Meningitis | 9.5| 9.4| 7.7| 7.9| 7.8| 7.9|11.0|12.2|16.8|18.6|17.7 Brain Trouble |10.1| 9.2| 8.3| 8.1| 7.2| 5.9| 5.9| 7.1| 9.0| 8.3| 8.7 Falls | 9.0| 7.2| 5.4| 4.5| 3.9| 4.2| 3.8| 5.2| 5.9| 6.1| 6.0 Measles | 5.1| 3.8| 3.8| 2.1| 3.9| 4.5| 4.1| 4.1| 4.8| 4.7| 4.4 Typhoid Fever | 3.7| 2.3| 1.6| 1.0| 0.9| 1.2| 1.0| 1.0| 1.3| 1.3| 1.2 Convulsions | 3.2| 4.4| 3.2| 2.9| 2.6| 0.2| 1.8| 1.8| 1.9| 1.5| 1.9 Various Fevers | 2.5| 1.5| 1.4| 1.0| 1.7| 1.6| 1.6| 1.6| 1.5| 1.3| 0.7 Catarrh | 2.3| 2.1| 1.9| 1.8| 1.6| 1.2| 1.0| 2.0| 1.9| 1.9| 1.4 Diphtheria | 1.9| 1.7| 1.9| 1.0| 0.9| 0.4| 0.6| 0.8| 0.9| 0.9| 0.7 Pneumonia | 1.5| 0.8| 0.8| 0.6| 1.1| 0.2| 1.0| 1.1| 1.1| 0.9| 1.1 Whooping Cough | 1.7| -- | 1.6| 1.2| 1.1| 1.0| 0.8| 0.6| 0.9| 0.9| 0.5 Miscellaneous | | | | | | | | | | | and Unknown | 2.1|20.4|26.7|19.8|18.6|23.7|14.7|25.9|15.4|14.2|15.1 1910|1911|1912| ----+----+----+ Total Number 570| 546| 518| ----+----+----+ Congenital 32.8|34.6|36.6| Scarlet Fever 6.1| 5.7| 5.0| Meningitis 17.9|19.0|19.7| Brain Trouble 8.3| 8.0| 8.9| Falls 5.1| 5.5| 5.6| Measles 4.6| 0.2| 0.7| Typhoid Fever 1.1| 0.9| 0.5| Convulsions 1.9| 2.0| 2.1| Various Fevers 0.5| 0.5| 0.7| Catarrh 0.8| 1.0| 0.5| Diphtheria 0.7| 0.7| 0.5| Pneumonia 1.1| 0.7| 0.5| Whooping Cough 0.5| 0.5| 0.2| Miscellaneous | | | and Unknown 18.6|20.7|18.5| II. CAUSES OF DEAFNESS IN MICHIGAN SCHOOL FROM 1883 TO 1912