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Measurements of the absorption o f light in thallium vapour from the series lim it at 2030 to 1450 A are described. The absorption cross-section at the series lim it is 4-5 ± 0 -8 x 10~18cm2 and the /-num ber for the continuum over the range o f the experiment is 0-025 + 0-005. Auto-ionization lines are observed at 2007, 1610 and 1490A in agreement w ith those reported by Beutler & Demeter (19346). The moderately sharp line at 2007 A (2P° -* 4P j) has an /-num ber o f 0-005 ±0-001 and adoi:10.1098/rspa.1954.0142 fatcat:2d5oqmhjivdppoy45qhdyu74ba