The articles have been scanned in colour with a HP Scanjet 5590; 300dpi. Adobe Acrobat XI Pro was used to OCR the text and also for the merging and conversion to the final presentation PDF-format. ; 1. A study has been made of the resistance offered by wool samples to compression at 65 per cent. relative humidity and 70°F. (21.1°C.) temperature. The study has been based mainly on results obtained with the "Pendultex" instrument, designed by Henning (1934), but some additional determinations were made by means of a static cylinder and piston method. 2. A relation has been derived whereby the work done in compressing a wool sample in the "Pendultex" apparatus may be calculated from the number of swings during which the amplitude is reduced from one fixed value to another. 3. During the final constant cycle of compression by the static method, the pressure bears to the inverse cube of the volume a linear relation. With the dynamic method, the law is obeyed by the first compression. 4. The pressure-volume relation is discussed from a theoretical point of view, and it shown that the inverse cube law may be derived on the basis of certain assumptions. An approximate value of Young's modulus by bending can be calculated. 5. An empirical exponential relation between pressure and volume is considered. 6. It is concluded that since the density of packing is not uniform at low degrees of compression, results obtained at low pressures should not be considered together with those obtained at higher pressures, where the density of packing is more uniform and the pressure-volume relation follows the inverse cube law. 7. The method of expressing compressibility and resilience by means of the work done during compression and release is discussed. It is concluded that in the comparison of different wools the work done should be evaluated between volume limits. 8. A marked reduction in resistance to compression with the adsorption of water has been found. 9. Fibre length has no influence on the resistance to compression down to ...