67

3.     The lymph was very good ; the vesicles appeared full and the cicatrices
good.

4.     No small-pox prevailed during the year, nor inoculation or other obstruc-
tion to the spread of vaccination existed with the exception of the one mentioned
in the first para. of this report.

5.     No irregularities in the progress of the vaccine disease have occurred,
nor have any ill effects resulted from vaccination.

6.     No instance of small-pox occurred after unmistakeably successful vaccina-
tion or after well marked previous small-pox.

                                                ADEN.

Surgeon G. W. R. Hay, M.D., Acting Civil Surgeon.
Population, 19,289.

There has been an increase in the number of persons vaccinated during the
past year of no less than 581 as compared with 1872-73. The number of cases in
which the operation was successful is also greater by 386. The percentage of
success is also higher, but is still, I think, much lower than it might be. The un-
successful operations are, I am led to believe, principally among the Somalis,
while among the Jews nearly every one succeeds ; this I think shows that it is not
altogether the manner in which the operation is performed which influences the
result. Many of the cases brought for inspection have the vesicles quite destroyed
by the persons having scratched them about the fifth or sixth day. I have not
been able to find out what sort of cicatrices result. The vesicles are also stated
to have been good. Those I have seen during the last two months when not
scratched have been typical. Lymph has been supplied during the year to the
different regiments and I believe has given satisfaction.

2. At present vaccination is practised thrice a week, once in camp and the
other two days at the Malla and Steamer Point.