Abstract
In previous papers the migration of Ascaris lumbricoides in the rat and mouse has been traced to the point at which the larvae of the worm reach the trachea of these animals on the 8th day after infection. As the result of further experiments it is now possible to trace the migration through a further stage, namely that occurring from the 9th to the 15th days after infection. My experiments have not as yet been carried beyond the 15th day and in the following summary the statement that larvae occur in a given situation up to the 15th day is not intended to imply that they do not persist therein after that date.

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