Notices of the proceedings at the meetings of the members of the Royal Institution of Great Britain with abstracts of the discourses . raphic Journal for Feb. 1902. , Ministry of Public Works—Giornale del Genio Civile, Royal Society of London—Philosophical Transactions, A, Nos. 301-303. Proceedings, No. 455. 8vo. Society—Nature Notes for Feb. 1902. of Arts—Journal for Feb. 1902. 8vo. Tacchini, Prof. P. Hon. Mem. (the Author)—Memorie della Societa degliSpettroscopisti Italiani, Vol. XXXI. Disp. 1. 4to. 1902. Tliurston, Prof. R
Notices of the proceedings at the meetings of the members of the Royal Institution of Great Britain with abstracts of the discourses . raphic Journal for Feb. 1902. , Ministry of Public Works—Giornale del Genio Civile, Royal Society of London—Philosophical Transactions, A, Nos. 301-303. Proceedings, No. 455. 8vo. Society—Nature Notes for Feb. 1902. of Arts—Journal for Feb. 1902. 8vo. Tacchini, Prof. P. Hon. Mem. (the Author)—Memorie della Societa degliSpettroscopisti Italiani, Vol. XXXI. Disp. 1. 4to. 1902. Tliurston, Prof. Robert H. Hon. Mem. —List of Books and Papers, 1902. 8vo. United Service Institution, Royal— Journal for Feb. 1902. 8vo. United States Department of Agriculture—Monthly Weather Review for Nov. Contributions from the National Herbarium, Vol. VII.: Plants used bythe Indians of Mendocino County, California. By V. K. Chesnut. 8vo. 1902. Nutrition Investigations among Fruitarians and Chinese, 1899-1901. Verein zur Befbrderung des Gewerbfleisses in Preuseen—Verhandlungen, 2. Fig. 2. 1902.] Prof. H. Becquerel sur la Badio-activite. 85 WEEKLY EVENING MEETING, Friday, March 7, 1902. Sir William Crookes, , Honorary Secretaryand Vice-President, in the Chair. Professor H. Becquerel, , Membre de lAcademie desSciences, Paris, Hon. Mem. Sur la Badio-activitS de la Matiere. La propriete que possedent certains corps demettre un rayonnementinvisible et penetrant, etait inconnue il y a six ans. Le mouvementdidees que susciterent les experiences de Rontgen conduisit a re-chercher si la matiere nemettrait pas de semblables radiations, et Tonpensa dabord au phenomene de la phosphorescence qui realisait unmode connu de transformation et demission denergie. Cette ideene devait pas sappliquer au phenomene qui nous occupe, mais ellefut cependant feconde. Elle conduisit a choisir parmi les corpsphosphorescents, les sels
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