A PIECE of flint-stone, 7 × 7 × 5 cm., was taken by Dr. T. Rayss on August 24, 1940, from the bottom of the Dead Sea near Kalliah from a depth of c. 150 cm. of water and handed to me. On the stone, brown spots and vein-like markings were seen, and when some of the material scraped from the veins was examined microscopically, brown cells of a blue-green alga were observed. The following day the stone was submerged in Dead Sea water of s.g. 1·1875, in a closed glass vessel and exposed to light near the window. It was left standing for three years and four months, during which time no visible change in colour was noticed. However, in the meantime, owing to very slight evaporation, the specific gravity of the water rose to 1·2026, and when once again a hanging drop was microscopically examined, four different types of micro-organisms were revealed. These were identified as follows:
Elazari-Volcani, B., Nature, 152, 301 (1943).
Elazari-Volcani, B., "Studies on the Microflora of the Dead Sea" (Jerusalem, 1940).
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