In order to verify the effects of postburn fluid infusion on the tissue water content,extravascular water volume,residual blood water volume,and total water volume of the major organs were measured in dogs inflicted with 50% TBSA third degree burns and the dogs received no fluid infusion,immediate infusion or delayed infusion respectively.It was found that the water contents of most of the canine organs,no matter they received fluid infusion or not,were higher than those of the control.The increase was especially marked in the extravascular water volume and less marked in the residual blood water volume,which suggests that the increase of water content of most of the organs of the burned animals results mainly from tissue edema rather than congestion and/or stasis of blood.