During an investigation of the composition and optical properties of resinite from bituminous coals of varying rank, it was found that in samples from the Northumberland coal field (England) some of the resinite occurred as thin films on cleat surfaces rather than as discrete globules. It is concluded that pressures and temperatures attained in the Northumberland seams under increasing depth of burial were sufficient to melt the resinite, without inducing any additional physical or chemical change, and permitted migration in the fluid state over short distances. Migration of resinite has not previously been recorded in bituminous coals, although analogous but more extensive effects have been described in thermally altered lignitic coals of Bohemia, Czechoslovakia.

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