Copy letter from Robert William Frederick Harrison, to Dr N H Alcock, Physiological Laboratory, University of London Professor Hartog has written asking if Alcock could have loan of the original blocks illustrating Hartog's 'Proceedings [of the Royal Society]' paper on 'The Dual Force of the Dividing Cell'. It is not usual practice to lend out the original blocks, so Harrison will instruct the printers to prepare electros. 20 February 1907