is evident. Of the remaining diseases none
plays singly a large part in the causation of deafness, and in most of
them the results are similar. Measles, typhoid fever, diphtheria,
pneumonia, and whooping cough show, with some fluctuations at times,
little change on the whole, beyond certain local differences. In the New
York Institution a decline is reported in nearly all. In the
Pennsylvania Institution a rather larger proportion for measles is seen
in later than in earlier years. In the Michigan School an increase seems
to be the case with whooping cough, but a decrease with typhoid fever.
In catarrh the results are not so uniform. In the New York and
Pennsylvania institutions a decline is manifest, though in the latter a
larger proportion is reported than at the beginning. In the Michigan and
Wisconsin schools rather an increase is noted. La grippe is only
reported occasionally of late years, and its real effects cannot yet be
ascertained. With respect to general fevers, their classification is
found to be so varying that little can be determined.

We now proceed to make comparison of the proportions of deafness from
the principal diseases in a series of years some time past with similar
proportions in recent years. The following tables give the several
proportions in the American School (Connecticut) in the entire
attendance from 1817 to 1844 and from 1817 to 1857, and in the new
admissions from 1901 to 1913; in the Ohio School in the entire
attendance from 1829 to 1872, and in the average annual attendance in
1904, 1905, 1906, and 1911; in the Iowa School in the entire attendance
from 1855 to 1870 and from 1855 to 1912; and in the New York Institution
in the entire attendance from 1818 to 1853 and in the average annual
attendance from 1899 to 1912.[38]

I. CAUSES OF DEAFNESS IN AMERICAN SCHOOL FROM 1817 TO 1844, FROM 1817 TO
1857, AND FROM 1901 TO 1913.

PERIOD |TOTAL NUMBER
| |CONGENITAL
| | |SCARLET FEVER
| | | |MENINGITIS
| | | | |TYPHOID FEVER
| | | | | |MEASLES
| | | | | | |WHOOPING COUGH
| | | | | | | |GENERAL FEVERS
| | | | | | | | |BRAIN FEVER
| | | | | | | | | |PNEUMONIA
| | | | | | | | | | |DIPHTHERIA
| | | | | | | |