Entries begin with Lyons' Director-Generalship of the Survey Department in Egypt and subsequently detail much of his long career at the Science Museum. Many entries relate to his official appointments and posts (for example, at the Royal Society) as well as honours received. Comprises diary entries with many newspaper cuttings and correspondence stuck in. Also stuck in are two photos: Members of the International Meteorological Congress, Innsbruck 1905; Officers of the Royal Society, July 1934