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46
infantll.r, mortality.
The nett mortality rates for groups of diseases show, in the case of males, increases
in the rates for last year due to the "Common Infectious Diseases,"* and that due to
"Developmental Diseaseswhile of the rates prevailing among females increases occurred
in those due to the first named group, and to the "Tuberculous Diseases.''

The rates given above confirm the view already expressed (see page 43) that the
reduction in the infantile mortality observed during the last few years is due to more
than the diminished prevalence and mortality from "summer diarrhoea." By excluding the
deaths from the " Diarrhœal Diseases," the infantile mortality among males during the past
year is reduced to 97, while that for the five years 1905-09 becomes 103, thus showing a
reduction of 6 per 1,000. Similarly the rate for females is found to be 72 last year, or 13 per
1,000 less than the mean rate (85).
Special Insula'.— As in past years, the deaths of infants under one have been separately
extracted for the six special "Insulæ," with well defined boundaries and characteristics. In
Table 35, such rates are compared with the mean rates for the preceding quinquennium, the
actual numbers of births and deaths on which last year's rates are based being given, to enable
the value of the rates, for comparative purposes, to be guaged. The highest rate recorded last
year was that of "North Wharf" (175), and the lowest that of "Hall Park" (80). In four of the
six insulae last year's rates were in excess of those recorded in 1909, but in two only was that
rate in excess of the quinquennial mean rate. The two most interesting changes are the
reduction in the rate in "Clarendon Street"—from a rate of 221 in 1909 and a mean rate of
137, to a rate of 122 last year—and the increase in that of "Queen's Park," where last year's
rate (109) was in excess of both the 1909 rate (81) and the mean rate (92). These figures
have not been taken out for a sufficiently long period to allow any conclusion to be drawn
from the chancre noted.

* The diseases included in each group will be found arranged under the Roman numerals in Table VI.
Appendix A.