Letter from Will Spens, University Pitt Club, King's College, Cambridge, to the Royal Society 'Sir, I am much pleased to hear that my paper on The Relatio between the osmotic Pressure and the vapour pressure of a Solution has been announced for reading at the meeting on [January] 25. I regret that I am unable to be present and that uncertainty as to the possibility of this has prevented my replying sooner. With apologies for this delay and thanks for your intimation. I am, yours truly, Will Spens'. 23 January 1906