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1. A method of gastrin bio-assay is described which can be used on as little as 30 ng synthetic human gastrin I at a minimum concentration of 2·5 ng/ml.

2. Pentagastrin or synthetic human gastrin I added to cat plasma can be stored on ice or at 4° C, for periods up to 27 hr without apparent loss of gastrin activity.

3. Between 1 and 13 min after the rapid I.V. injection of pentagastrin in the anaesthetized cat and between 1 and 15 min after the injection of synthetic human gastrin I, there is a rapid reduction of the gastrin concentration in the arterial plasma. The data relating log₁₀ gastrin concentration in arterial plasma with time can be fitted by a single term.

4. Studies in vitro show that over the periods of time involved in the in vivo studies, both pentagastrin and synthetic human gastrin I are stable in cat plasma at 37° C in concentrations which occurred in the circulating plasma.

5. The half-life of pentagastrin in the circulating arterial plasma of the anaesthetized cat is 1·50 min (S.E. ± 0·08) and the half-life of synthetic human gastrin I is 2·65 min (S.E. ± 0·09).