A method is described whereby the swelling of single fibres in air of varying relative humidity (R,. H.) may be watched under the microscope. Results for changes in exterior dimensions and twist of a cotton fibre, also for changes in section area in both cotton and Celanese, with changes in R. H. are given. The rate of contraction of section area in Celanese when the dry fibre is exposed to air at 100% R. H. and the rate of swelling of section when the wet fibre is exposed to dry air are given. A qualitative explanation of results is offered.
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