Abstract
1. The specific conductance of the allantoic and amniotic fluids of the developing chick has been determined over the period of incubation between the 7th and 19th days. 2. Changes in this property have been related to changes in the chemical composition of these two fluids. 3. These conductance values are of importance in that they show the relation between ionized and un-ionized materials present in the two fluids.

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