“…These various experimental results, although performed in different laboratories with all the variability of procedure, animals and even dosage, do seem to fall into a logical sequence. The early changes suggest an effect of the oestrogens and other steroids on permeability, as has been noted before (Kalman & Lowenstein, 1958;Elliott & Yrarrazaval, 1952). There is evidence that the primary effect of oestradiol is on the capillaries, causing permeability to protein but not to red cells (Kalman, 1958;Zierler, 1958).…”