THE annual report of the Indian Association for the Cultivatfcm of Science, Calcutta, for the year 1945 includ iJilAreport of the Committee of Management, with out of papers published in the Proceedings of tha bciation and in the Indian Journal of Physics, theMaccounts of the Association for the year ended December 31, 1945, and budget estimates for 1946. An appended report on the scientific work of the Association by Prof. K. Banerjee refers to the continued detailed study of extra reflexion of X-rays from crystals of phloroglucinol dihydrate, benzil, and dinitrobenzene and pyrene. The intensities of the reflexion due to spatial derangement waves in general fall off very rapidly, showing that the wave-lengths of the derangement waves responsible for these extra reflexions are long. With benzil the intensities of the continuous lines due to planar derangement waves fall off gradually and much more slowly than diffuse spots. X-ray studies on jute fibres showed that methylene blue and Congo red cause no structural change in the cellulose, but complete delignification with chlorine dioxide over a long period causes partial dishevelling of the cellulose fibres, though no further change in diffraction pattern resulted on dyeing. Mercerized jute, dyed or undyed, also gives the typical mercerized cellulose pattern.