Letter from Howard Walter Florey to M Hayter Ethel Reed, North Adelaide Priory Street, Cambridge. Is to lecture to pathological class on electrocardiographs - has been asked to do some lecturing as when the department moves to new building in 2-3 years, may be given charge of "Physiological pathology" - still struggling with problems connected with permeability of capillaries to starch - discusses techniques used - hopes to use these methods for measurement of viscosity of endothelial cells - thinks that, when cells become more permeable, dispersion of constituent colloids is altered - discusses this and proposed experiments on frog - comments on pleasures and on man's need to be thought well of by others - comments on English society - comments on the R33 airship. 19 April 1925