55-1912|1672|26.9|10.3| 14.9|1.7|2.2|1.7|0.1|7.0|0.3|0.8|1.7| 32.4

IV. CAUSES OF DEAFNESS IN NEW YORK INSTITUTION FROM 1818 TO 1853 AND
FROM 1899 TO 1912.

PERIOD |TOTAL NUMBER
| |CONGENITAL
| | |SCARLET FEVER
| | | |MENINGITIS
| | | | |TYPHOID FEVER
| | | | | |MEASLES
| | | | | | |WHOOPING COUGH
| | | | | | | |GENERAL FEVERS
| | | | | | | | |BRAIN FEVER
| | | | | | | | | |PNEUMONIA
| | | | | | | | | | |DIPHTHERIA
| | | | | | | | | | | |CATARRH
| | | | | | | | | | | | |UNKNOWN
| | | | | | | | | | | | |AND MIS.
---------+----+----+----+------+---+---+---+---+---+---+---+---+--------
1818-1853|1148|42.9| 7.2|--[39]| --|1.9|0.7|1.6| --| --| --| --| 45.7
1899-1912| --|38.0| 6.8| 13.1|1.3|3.4|0.8|1.3|8.1|0.9|0.9|1.7| 23.7

Taking these tables also collectively, we find in respect to scarlet
fever a decline in all the schools, this being especially pronounced in
the case of the Ohio. In meningitis, however, there is an increase so
heavy as to call in question the accuracy of the earlier records; and it
is possible that it failed to be entirely recognized then. In most of
the other diseases, as in the previous case, no very great change is
perceptible. In general fevers a decline is apparent in all, in most
being considerable; and probably several diseases were formerly included
which are now listed separately. In measles rather a decline is found in
the American and Ohio schools, but a slight increase in the Iowa, and a
somewhat larger one in the New York Institution. In typhoid fever there
is a slight increase also in the Iowa School, but a decrease in the
Ohio. In brain fever a considerable increase is observed in the Iowa
School, but a slight decrease likewise in the Ohio. In whooping cough
there is an increase in the New York Institution and the Iowa School,
but a decrease in the American. Such diseases as pneumonia, diphtheria
and catarrh seem not usually to have been separately classified in the
past, though in the Ohio School we find diphtheria noted, and with
somewhat smaller proportions than in later years; while in several