A group of four items by pioneering European scientists, includes: CLAUDE LOUIS BERTHOLLET, French chemist, a Senator of Napoleon and participant in his Egyptian Campaign. He discovered silver fulminate and the bleaching effects of chlorine. A.L.S. "Berthollet Sénateur" 1p. 4to., Jan. 18, 1812, to the Minister of Trade and Commerce commending fellow scientist Baron Louis Costaz, also a veteran of the Egyptian Campaign; AUGUST WILHELM VON HOFMANN, German chemist who pioneered in aniline dye research. The terms "Hofmann rearrangement" and "Hofman elimination" are named for him. A.L.S. 1p. 8vo., [London], Jan. 5, 1856, in English to Dr. Dankens recommending: "...A. Church who has just accepted the position of Assistant in the Chemical Laboratory of your Colleague Mr. Brodie [possibly Benjamin C. Brodie, the English surgeon], Mr. Church has been for a succession of years a pupil and subsequently an Assistant in my Laboratory. He is extremely zealous to get on in Science. I have no doubt that he will make his way if he continues to work with the same activity..."; JOSEPH LISTER, English surgeon and medical scientist greatly influenced by Louis Pasteur, leading to his founding of antiseptic surgery. Third person A.L.S. "Lord Lister" 1p. 8vo., London, July 9, 1897, in part: "Lord Lister sends the enclosed as a contribution to the Essex Devastation Fund which the Lord Mayor has had the kindness to open at the Mansion House..."; and FRANCIS GALTON, the founder of eugenics. A.L.S. 1p. 8vo., London, Nov. 25, 1873, to Thomas William Evans, in part: "...Railroads & other overruling powers permitting, I will come to you by the earlier of the two trains...". Four pieces, very good to fine condition.