Abstract: An electronic analgesia/anesthesia apparatus is provided for the administration of a mixture of gases. This said apparatus has separate controls for independently increasing or decreasing the flow rate of each particular gas to be delivered thereby and includes an electrical circuit operatively connected to each control for driving a display indicative of the flow rate of the gas and a percentage calculator connected to each individual control for calculating the percentage of a particular gas with respect to the total gas flow and for displaying same; high and low pressure limit alarms and a pressure responsive safety control are included.