“…"Working approxi¬ mates" or "estimates" are better terms for the initial calculation of howmuch and what kind of fluid to give in a particular instance, and from that point modifications are made according to the response of the patient and further laboratory studies. Whenever possible, information on water and electrolytes should be of a usable nature and should be presented to physicians in a manner to aid them in the care of their patients, and in the development of present information it is fitting to pay tribute to the important obser¬ vations of O'Shaughnessy,1 Schmidt,2 Fagge,3 Stadelmann,4 Rogers,5 Nichols and Andrews, 6 Trout,7 Hartwell and" Hoguet,8 Henderson,9 Macallum, 10 Matas, 11 Gamble,12 Orr and Haden,13 Van Slyke,14 Peters,15 Hartmann, 16 McCance, 17 Newburgh,18 Coller,19 Darrow,20 Butler and Talbot.21 For those wishing to review basic material on water and electrolyte balance I highly recommend Gamble's lecture syllabus on the chemical anatomy, physiology and pathology of extracellular fluid.22 WATER AND DEXTROSE Water comprises about 70 per cent of the total body weight23 and is distributed in two physiologic compartments, the intracellular and the extracellular. The intracellular fluid makes up approximately 50 per cent of the total body weight and the extracellular about 20 per cent.…”