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Many grid-controlled gas-discharge tubes, such account of the requirements for a discharge self-maintained by ionization by as those with the trade names "grid-glow tubes, LiiyraLrons , and similar devices, 2. ELEKTRISCHE DURCHBRUCHFELDSTARKE VON GASEN by W. 0. Schumann "thyratrons" and similar devices, furnish examples (Springer) contains a complete and valuable summary of work on sparking of the independently heated cathode type of dis-gradients and sparking potentials up to 1923. ofarge atnlowepressurently heatedcathodetypeofdis 3. DER ELEKTRISCHE LICHTBOGEN by A. Hagenbach (Akademische Verlag) contains a summary of older work on the characteristics of arcs. 4. The 2 German handbooks, HANDBUCH DER PHYSIK, V. 14 (Springer) and BIBLIOGRAPHY HANDBUCH DER EXPERIMENTALPHYSIK, V. 13, part 3, "Selbstandige Entladungen