Varving nunbers of determinations for the systems Listed in Tables 1 and Zaye due toa considerable time lapse between collection of the samples aud their reeeipt tn Lhe laboratory. As a consequence, elther no petcetn or an unslear pattern (even after repetition) was occasionally obtained for a given trait. Three persons had the PCN, -7 phenotype. Because of the occurrence of this variant in polymorphic proportions elsewhere ‘im Micronesia (see below) , we tabulate it.with the: polymorphisms. These three individuals were related as siblings, one of whose parents was tested and normal, the other untested. 2. Rare variants.--One rare variant was observed in a total of 4047 determinations. This was a fast albumin variant detected by only one of the three screening systems ‘in use for albumins, namely, the pH 5.0. sodium acetate buffer system of Weitkamp et al (10). is illustrated in Fis wg. Ll. ‘The variant Its electrophoretic behavior appears similac to that of albumin tedén as reported by Weitkamp et al (10). Lt occurred in a girl, aged 5, whose mother was normal (and not exposed to fall-out) and father not available for g tudy. The fact that the variant has heen demonstrated in only a single person with only one technique leaves its identification somewhat unsatisfactory, but the situation cannot be improved upon at present. DISCUSSION Ll. The polymorpliisma.--Gene frequencies for the 6 polymorphisms encountered all’ fell within the rather considerable range reported in other studies of Micronestans (12, 13, 14, 15, 16, 17, 18, 19). Dongs