Letter from [James Hopwood] Jeans, 8 Ormonde Gate, Chelsea, S.W, to Mr [Robert] Harrison, [Royal Society] Responding to previous correspondence in relation to the Bakerian Lecture, specifying that his intention is to speak on the paper "On Gravitational Instability". Informs he has a longer paper which he will send Harrison and which he also proposes to speak about at the lecture. 22 April 1917