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107
it is found that microscopic examination of the tissues
unmistakably distinguishes infections due to avian bacilli
from infections due to mammalian bacilli.
13. It is, however, not possible in the tissues of all
animals under all experimental conditions, to distinguish with
certainty under the microscope, lesions due to avian bacilli
from lesions due to mammalian bacilli. It is sometimes
found that in the tissues of mammals the avian bacillus
produces tubercles of a chronic type which are indistinguishable
from tubercles produced by mammalian bacilli.
Respiratory Diseases.
Under this heading are included bronchitis, pneumonia,
pleurisy, and other diseases of the respiratory organs.
The number of deaths registered was 326. Of these deaths
62 were children under one year of age, 62 over one and under
five years, and 82 were persons over 65 years of age.
Bronchitis was most severe near the river in the East and
North Wards. Broncho-pneumonia, pneumonia of all forms
were also more severe in these two wards and accounted for
more deaths than any of the other wards.
Influenza.
This disease, which is an infectious one, accounted for 13
deaths during the. year. Eleven of the deaths occurred between
the ages of 25 and 65, and the North Ward accounted for six
of the deaths.