It almost takes one by surprise to find that certain chronic renal diseases are found to derive great benefit by limitation of the allowance of drinks, but on calm reflection one must perceive that such a procedure is only a further example of the principle of lightening the burden of a weakened organ. The kidney excretes practically half of all the liquid which is swallowed, and so long as this quantity is not reduced below the amount required for the elimination of the urinary end-products of metabolism, nothing but good can accrue from diminishing the labours of an already overtaxed organ. In the only cases which are found suitable for this restriction of liquids, viz., those of chronic contracted kidney, it is found that the fluid intake may be reduced as low as 1 1/2 or even 1 1/4 litres without any risk. Even in acute nephritis it is wise just at first to lessen the consumption of fluids, unless uraemia should develop, when water may be administered freely.