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Dual type of facilitation at the neuromuscular junction of the frog

End‐plate potentials were recorded intracellularly at the frog neuromuscular junction. Facilitation produced by conditioning shocks applied to the motor nerve was studied in two different ways: using either low‐frequency trains in Mg‐blocked preparations or using brief high‐frequency trains followed by a test shock of variable latency in D‐tubocurarine‐blocked preparations. In both cases, two distinctly different types of motor end‐plates were observed. The first type showed a low quantum content and a marked facilitation without depression, while the second type showed a high quantum content, a poor facilitation, and a marked depression. The physiological significance of these findings is discussed.