Letter from W [William] Ramsay, University College, University of London, Gower Street, to [Joseph] Larmor Ramsay writes from the laboratory after comparing R's [Rutherford's] figures with theirs. The original corrections should be regarded as a printing error which would have been corrected long ago if they had seen them. The addendum should be dated and treated as a separate paper, following on. He discusses discrepencies between [spectral] lines in their respective observations, and different intensities. He thinks it almost certain that the spark-spectrum, as with most gases, is different; both reserachers have measured partly one, and there must be an attempt to separate the two. 18 August 1908