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Telemetry offers special advantages for recording electromyographic changes in the uterus of rhesus monkeys, and this technique has been successfully employed to study animals moving freely and interacting with others in our colony. The transmitter used was of the F.M./F.M. type, with a carrier frequency of approximately 100 MHz. A three-stage pre-amplifier gives a gain of 400; the transistors are operated at low collector currents to give a high input resistance and low-power consumption. Negative feedback over each stage increases the input resistance still further and ensures stability and low distortion. The frequency response is flat from 0·5 Hz to 4 kHz and the noise level over this frequency band is below 5 µv (source resistance 10 k the input resistance is > 1 M The subcarrier oscillator is a multivibrator of centre frequency 6·5 kHz. This circuit gives good linearity, has a high input impedance and low power consumption;