Abstract
It has not been easy to study the rate at which female Trichinella spiralis produce their offspring. Phillipson and Kershaw (1961) described a method of repeatedly grinding and washing infected muscle to collect immature larvae so that one could determine the number of larvae born by the time the animal was killed but their method is unsuitable for dealing with the large number of animals that would be needed for a thorough study of this aspect of the infection. We have sought a method of studying this important factor in the host-parasite relationship.