The fact of this increased leucocytic activity during the early stages, or the whole course of infection by Cestodes, is indirect proof that these parasites do normally discharge toxic substances into their hosts.
Hence quinine stops the process of diapedesis or emigration of the leucocytes from the blood-vessels into the tissues, and if applied to the, extravascular spaces it arrests the leucocytic movements there.
It is therefore plain that the diminution of leucocytic movement is to be regarded as a sign of diminished metabolism within the cells.
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