Copy letter from Robert William Frederick Harrison to Dr H [Hans Friedrich] Gadow FRS 'Dear Dr Gadow, I hope all is straightforward with regard to your demonstration for the Soiree. I have just received back from Mexico, covered with forwarding stamps, the envelope containing the enclosed receipt for your last year's subscription, which was sent out to an address in Mexico which we had in the Office here. It may interest you to see the envelope.' 26 April 1909