IN MAY 1960, the predecessor of this magazine, Scientific Lubrication, published an issue devoted to the subject of “ Hydraulic Systems and Oils,” intending it to be “ … of practical and theoretical value to all readers who design, manufacture, install or maintain hydraulic equipment.” The articles were of undoubted value adding, as they did, to the store of information on hydraulic oils already published. Paradoxically, one hydraulic equipment manufacturer has recently been heard to remark that the majority of this type of literature, although issued by oil companies, gives greater descriptive coverage to the equipment than it gives to the oils. The implication was that the equipment manufacturers' greatest need was for fuller information on the oils, not the equipment.