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The Behavior of Trichomonas Vaginalis in a Semi-Solid Medium¹

1. In a semi-solid medium T. vaginalis sent out a long, clear pseudopodium containing the 4 anterior flagella and the undulating membrane.

2. This pseudopodium was in constant motion, though the trichomonas did not change its position.

3. The pseudopodium was frequently withdrawn into the body.

4. After 48 hours in the semi-solid medium a much longer pseudopodium was often formed. This could not always be withdrawn and was considered a sign of degeneration. The addition of Ringer's solution sometimes brought this form back to normal.

5. The axostyle with its row of granules on either side was clearly visible in these forms.

6. The density of the medium and the contractile tension of the protoplasm were important factors in the formation of these long pseudopodia.

Received November 3, 1943.
¹ Read by title at the Thirty-Ninth Annual Meeting of the American Society of Tropical Medicine, Cincinnati, Ohio, November 16–18, 1943.