Henri BECQUEREL. Partially autograph manuscript, Observations météorologiques faites dans la Haute-Sangha (Congo français) par Mr Ferrière, résumées par Mr Becquerel, professeur au Muséum, [fin 1895]; 19pages in-4 (including 7 autographs). Henri Becquerel summarizes the data collected, day by day, over an entire year in Haute-Sangha (Central Africa). The manuscript includes Ferrière's 12 daily data sheets. After analyzing all this data, Becquerel concludes: "In concluding this exposé, I cannot help expressing one regret, which is that we were unable to collect the quantity of water that fell. Moreover, the substitution of recording thermometers and barometers for direct-reading instruments would provide much more complete results, but we must nonetheless thank and congratulate Mr. Ferrière for the conscientious work he has carried out, which constitutes an important document on the climatology of Central Africa". Enclosed: - a printed memoir by Becquerel: Mémoire sur les températures observées sous le sol, au Muséum d'Histoire Naturelle, pendant l'hiver 1890-1891; - the manuscript of a biographical and bibliographical note on H. Becquerel and his work (18p. in-fol.); 9 letters addressed to Becquerel, notably from German, English and French scientists (A. Brass, R. Fleischer, A. Garrigou, Ch. Horner, E. Wiedman...); a l.a.s. with manuscript from Dr. Julien Thore of Dax, about his discovery of a "new force", June 16, 1887 (12p. in-4).