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193. Note on the velocity of gaseous particles at the negative pole of a vacuum tube. 

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194. Scientific jokes (signed G. H.). 1880. Nature, xxi, pp. 349, 368, 396. 



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199. Further remarks on the colouring of maps. 1880. R.S.E., x. 



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207. Note on the temperature changes due to compression. 1881. R.S.E., xi. 



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