Copy letter from Herbert Rix, to C T Hagberg Wright, London Library, St James's Square, S.W. 'Dear Sir, One of the volumes returned here the other day appears to be missent. I inclose a memorandum of the volume, and the title of one for which we think perhaps it has been substituted. I am, yours truly, H Rix Asst. Sec. R.S. [Assistant Secretary, Royal Society]'. 18 December 1895