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56
bacillus. Its colonies in the Eisner medium were typical
typhoid-like. It was agglutinated by typhoid blood, whereas
normal blood did not produce agglutination."
The Institute made some further experiments on animals, and
were satisfied that it was the genuine typhoid bacillus which was
present in the interior of the cockles.
Although the typhoid bacillus has been found in oysters, and in
the fluid contained in their shells, this is the first time its presence
has been demonstrated in cockles.
Leigh-on-Sea.
Cockles are spread out on the banks of the creek until required for market. One patch
of cockles is shown in the foreground, another on the opposite side of the creek.
They are covered at high wa'er. The sheds where the cockles are prepared for
market are on this side, a few yards further back.
Particulars of the case were sent to the Medical Officer of
Health for Leigh-on-Sea. I had the opportunity of discussing the
matter with the Medical Officer of the Local Government Board
and Dr. H. Timbrell Bulstrode, who reported on the Leigh cockle
trade in 1896.* From that report I have made the following
extract:—
* Report on the cultivation and storage of oysters and certain other molluscs, in
relation to the occurrence of the disease in man, p. 94.