Letter from A D Gardner to L L Lenz, Cairo Is dealing with Florey's correspondence - would like more particulars of Lenz's experiments on the hyphomycete - Lenz's sketch reminds him of the lactobacillus of Doderline - could it be this microbe which is causing the effect Lenz mentions - has he done experiments in vitro on its bacteriostatic action - if sends a culture, will examine it. 20 October 1944