Referee's report by Harold Warris Thompson, on a paper 'Photoconductivity in the infra-red region of the spectrum. II. The mechanism of photoconductivity in lead telluride' by O Simpson and Gordon Brims Black Mcivor Sutherland Sectional committee: Physics Paper reference code: A184 Recommended for publication in the Philosophical Transactions with remarks to see full comments in previous report for Part I [RR/73/245]. [Published in Proceedings A, 1951]. Date received not given. 1950