TO the author of this book we owe the use of lead plates instead of platinum plates in voltameters. His experiments showed that, after repeated charging and discharging of lead-plate voltameters, accumulators of energy were producible which might be employed in a great variety of useful ways. He showed that his accumulators might be charged in parallel by a few Bunsen or Daniell cells, and discharged in series. As his accumulators had small internal resistances, he was able to give to circuits either of small or great resistance very considerable supplies of electric power for short times, and as an experimenter he availed himself of this novel power in heating wires, melting beads of metal, and generally of observing effects produced by strong currents. The Storage of Electrical Energy. By Gaston Plante. (London: Whittaker, 1887.)