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We wish finally to describe experiments in which an attempt was made to make measurements with an ionisation chamber, one side of which consisted of animal tissues. The physical aspects of the results only will be discussed. The graphited paper chamber which previously served as standard was here abandoned as still showing too great variation compared to a standard air chamber to act as the standard of comparison against tissues, since the latter were themselves likely to be approximately "air" substances. We have therefore, constructed a small cylindrical chamber of graphited cellophane, 14∙7 mm. long, 12∙7 mm. diameter, having walls 0∙002 cm. thick. The chamber is sealed with a thin celluloid end, the cylindrical portion being made by wrapping the graphited cellophane around a brass former and sealing with a saturated solution of cellophane in amyl acetate. This chamber was tasted against the air chamber as before and it will be seen that from 60 K. V. with 0∙5 mm. Al filtration to 130 K. V. and 10∙7 mm. Al filter, the deviation is not greater than the experimental error of 2 per cent.

Secondary electronic emissions from metal foils and animal tissues