| Description | 'Dear Sir, with reference to my representatives call this afternoon regarding the blocks to illustrate Major Horrocks paper on "Experiments made to determine the Conditions under which "Specific Bacteria" derived from Sewage may be present in the air of Ventilating Pipes, Drains, Inspection Chambers, and Sewers", which was communicated to the Royal Society on February 7th, 1907, I should be obliged if you would kindly supply me at your earliest convenience with electros of the seven illustrations. I will remit the cost on hearing from you of the amount. Yours faithfully, E White Wallis'. |