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O. volvulus is transmitted by sandflies, and their role in the transmission of onchocerciasis was discovered by the Scottish parasitologist Breadablane Blacklock in Sierra Leone in the mid-1920s (19). There are accounts of the history of onchocerciasis by Grove (105) and Muller (192).
Xenon was discovered in 1898, in London, by William Ramsay and Morris Travers. They discovered it in the residue remaining after liquid air had been fractionally distilled. Spectroscopic analysis showed the previously unseen beautiful blue lines that indicated the presence of a new element â xenon. Travers wrote of their discovery, âkrypton yellow appeared very faint, the green almost absent.