The following list of dates includes most of the samples processed from 1968 to 1972. Proportional counting is used and the counting gas is CO2 at constant filling pressure of 740mmHg at 22°C (Thommeret et al., 1969). Samples are counted at least twice on two different counters and errors quoted are averages of standard deviations obtained on each counting.

The following list of dates contains most of the measurements obtained since our last list. Procedures of measurements and calculation are as previously described in Radiocarbon, 1964, v. 6, p. 194–196; 1966, v. 8, p. 286–291. A new 1.1 L counter, all metal and quartz, built in the laboratory has been in use since 1967.

This series reports some of the measurements made since publication of the previous list. Chemical preparation of samples is basically the same as described in Monaco I.

The counting electronics of the proportional counter has been entirely rebuilt by J. Galliot and P. Albertinoli of C.S.M. The new device is transistorized and battery-operated. At regular intervals of time, usually 10 min, the count (anti-coincidence channel) is printed in tape. Large deviations from the mean are easily visible and can lead to rejection of the measurement if the distribution is not normal, i.e. does not fit a straight line on Gaussian paper.