to biologists and geologists, his notes will also be of value to historians, geographers, and anthropologists interested in this period of Colorado’s history.” Those field notes, transcribed in 2001 by Professor Peter Robinson of the University of Colorado at Boulder, are available online. Henderson was one of the first to study and publish on the extinct (1905) and existing (1910) glaciers of Colorado. Henderson was especially interested in documenting the Arapaho glacier, of which he took many photographs from 1902 to 1922.[6] Photographs taken by him of glaciers can also be viewed online.[7Henderson was one of the first to explore the Arapaho glacier, of which he took many photographs from 1902 to 1922. Photographs taken by him of glaciers can also be viewed online. “In the early 20th century,” according to one source, “the biology program of the University of Colorado, led by Dr. Junius Henderson and Dr. Gordon Alexander, made significant contributions to early lists of birds.” He specialized, however, in mollusks, discovering 28 living and 33 fossil molluscan species. His complete checklist of freshwater and terrestrial mollusks of Idaho, published in 1924 (a supplement was issued in 1936), was not superseded until the year 2000. The Albuquerque Journal noted in 2008 that Henderson, visiting New Mexico in 1912 with Wilfred William Robbins, “puzzled over what they called New Mexico's 'great desiccation.'” While the state, they observed, had “insufficient moisture to support a large population,” archaeological evidence showed that large cities had once thrived there. Henderson remained Curator of the Museum until his retirement in 1933, when he was succeeded by Hugo G. Rodeck. In retirement, Henderson continued to pursue research. He died on November 4, 1937. A 2003 article in the Fort Collins Coloradoan, headlined “Henderson helped shape understanding of state,” celebrated Henderson's contributions to Colorado's heritage. “Read the early literature on Colorado birds,” wrote Kevin J. Cook, “and the name 'Junius Henderson' pops up again and again. Read about mammals in Colorado, or about reptiles and amphibians, or mollusks, especially mollusks, and Henderson appears. Read about Colorado itself, its geology and geography, or especially its glaciers, and Henderson figures prominently.” During Henderson's tenure, the Museum was located in the Hale Building. The current museum building, which opened in 1937, is now known as the Henderson Building. Honors and awards Henderson was elected a member of the Malacological Society of London in 1913. Personal life Henderson was married