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Published online by Cambridge University Press: 18 November 2009
The number of cysts used for each replicate in a dilution hatching trial may be reduced to 10. Log. total hatch is used, instead of total hatch itself, and the mean for each dilution determined from the log. values; the logs, of these means, plotted against dilution in the usual way, gives a straight line as in the original Fenwick technique. Reduction of the number of cysts permits the use of commercially available utensils to form an easily handled set-up.