| LOCKYER | Norman -, founder of scientific journal Nature jointly credited with detecting helium in 1868 (7) |
| WYKEHAM | William of -; bishop who directed the reconstruction of the upper ward of Windsor Castle in 31 Any one of the 300 billion luminous bodies of hydrogen and helium in the Milky Way whose birth takes plac |
| HUNTER | Type of pocket watch with a hinged lid; a brand of wellington boot; or, Scottish anatomist considered a founder of scientific surgery (6) |
| NATURE | Scientific journal in which the existence of neutrons was first proposed |
| LEIBNITZ | Wilhelm ____ is jointly credited for the discovery of calculus |
| IMPEACH | To charge with offences, as in the case of US President Andrew Johnson in 1868 (7) |
| STAR | Any one of the 300 billion luminous bodies of hydrogen and helium in the Milky Way whose birth takes place inside a nebula (4) |
| BIOSPHERE | New-fangled probe is filled with helium in a controlled environment (9) |
| NATUREABHORSAHOOVER | Reason that the prestigious scientific journal refuses articles from President Herbert's relatives? |
| SMITHFIELD | Meat and poultry market in London which opened in its modern form in 1868 (10) |
| RAGTIME | King Of ____ , nickname of U.S. composer and pianist Scott Joplin born in 1868 (7) |
| REAL | Old unit of currency in Spain, replaced by the peseta in 1868 (4) |
| BRAZIL | Angela, writer of 'modern schoolgirls' stories', born in Preston in 1868 (6) |
| GRANNYSMITH | A variety of apple that originated in Australia in 1868 |
| GASMEN | They make you laugh, as they're supposed to check the helium in the air presumably (6) |
| MOYGASHEL | Put fuel (helium) in old mule to make fine linen |
| CELL | Distinguished peer-reviewed scientific journal |
| CHEYENNE | In 1868, what name was rejected in favour of Wyoming, but was adopted for the state's capital city? (8) |
| CRO | ___-Magnon man (early Homo sapiens whose remains were first found in France in 1868) |
| ARCHIBALDTAIT | Edinburgh-born priest (1811 -82)appointed Archbishop of Canterbury in 1868(9,4) |
