ON March 8, 1946, Dr. M. Levy, a chemist in the Palestine Potash Company at the north end of the Dead Sea, handed us a number of living specimens of the brine shrimp (Artemia salina) which he had found in abundance in the salt-washing pans of the potash works. In these pans the salt residue of Dead Sea water is washed out by admitting fresh water from the Jordan. This water gradually increases in salinity, but the various ions are represented in this solution in proportions differing from those of Dead Sea water. Especially, the magnesium concentration is relatively much lower than in the Dead Sea. At the time of collecting, the specific gravity of the water measured at 20° C. was 1.173 (potassium chloride 4.2, sodium chloride 22.0, calcium chloride and magnesium chloride 37.2 gm./l,; total of chlorine, 165 gm./l.).