Abstract
Summary
1. The mean number of allantoic cells per square centimeter of the allantoic membrane in 10-day embryonated chicken eggs has been estimated by direct counting with the phase contrast microscope. 2. In the chronic (CA) portion of the allantoic membrane there were 1.66 × 105, and in the amnion-yolk sac (AYA) portion 3.00 × 105 allantoic cells per cm2. 3. The total area of the allantoic membrane was measured directly. The area of the CA portion was 57.9 cm2, that of the AYA portion was 29.1 cm2, and that of the entire membrane was 87.0 cm2. 4. The number of cells lining the allantoic cavity of the 10-day chick embryo was estimated to be 1.8 × 107.
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