Copy letter from Herbert Rix, to Professor George Downing Liveing Rix is instructed by Lord Rayleigh to send the accompanying four papers which have been referred to Professor Liveing: J N Lockyer on the spectrum of the nebula of Orion, and preliminary note on photographs of the spectrum of the nebula of Orion; Huggins and Huggins, on a redetermination of the position & c., and a note on the photographic spectrum of the great nebula in Orion. 23 April 1890