1864) June 14 Mary Cassatt, American painter and printmaker (b. 1844) Windham Wyndham-Quin, 4th Earl of Dunraven and Mount-Earl, Anglo-Irish politician (b. 1841) June 18 – Olga Constantinovna of Russia (b. 1851) June 23 – Jón Magnússon, Icelandic politician, 1st Prime Minister of Iceland (b. 1857) July–September July 1 – Carlo Luigi Spegazzini, Italian-born Argentine botanist and mycologist (b. 1858) July 2 Émile Coué, French psychologist (b. 1857) Kristján Jónsson, Minister for Iceland (b. 1852) July 9 – Mother Mary Alphonsa, American Roman Catholic religious sister, social worker, foundress and venerable (b. 1851) July 12 Gertrude Bell, British archaeologist, writer, spy and administrator; known as the "Uncrowned Queen of Iraq" (b. 1868) John W. Weeks, American politician in the Republican Party (b. 1860) July 14 – Roshanara, Anglo-Indian dancer (b. 1894) July 17 – Bernard Coyne, Irish Roman Catholic clergyman (b. 1854) July 18 – Tiburcio Arnáiz Muñoz, Spanish Roman Catholic priest and venerable (b. 1865) July 22 Willard Louis, American actor (b. 1882) Friedrich von Wieser, Austrian economist (b. 1851) July 23 Charles Avery, American actor, director and screenwriter (b. 1873) Fumiko Kaneko, Japanese anarchist and nihilist (b. 1903) July 26 Ella Adayevskaya, Soviet composer (b. 1846) Philippe Sudré Dartiguenave, Haitian political figure, 25th President of Haiti (b. 1863) Robert Todd Lincoln, American statesman and businessman, son of 16th President Abraham Lincoln (b. 1843) July 30 – Albert B. Cummins, American lawyer and politician (b. 1850) July 31 – Bronislav Grombchevsky, Soviet army and explorer (b. 1855) August 1 – Israel Zangwill, British novelist and playwright (b. 1864) August 6 – Constantin Climescu, Romanian mathematician and politician (b. 1844) August 14 – John H. Moffitt, American politician (b. 1843) August 21 – Ugyen Wangchuck, King of Bhutan (b. 1861) August 22 Charles W. Eliot, President of Harvard University (b. 1834) Joe Moore, American actor (b. 1894) August 23 – Rudolph Valentino, Italian actor (b. 1895) August 27 – John Rodgers, American naval officer and naval aviation pioneer (b. 1881) August 30 – Eddie Lyons, American actor (b. 1886) September 15 Alexander Boyter, American stonemason (b. 1848) Rudolf Christoph Eucken, German writer, Nobel Prize laureate (b. 1846) September 17 – Rashid Tali’a, 1st Prime Minister of Transjordan (b. 1877) September 21 – Léon Charles Thévenin, French telegraph engineer (b. 1857) September 25 – Herbert Booth, English Salvationist, third son of William and Catherine Booth (b. 1862) September 26 – José