The reason why this problem has till now not been solved is that none of the inventors could rid themselves of the idea of gas-lighting, and that all have adhered to the system of produciug tho Elcc- tricitjk m some cc tral place, or by large machinery, instead of first laying down tho principle that a Lamp which should ever be- come generally useful and popular must be portable, liko an Oil Lamp, and contain the generator of Electricity m itself, i.e., m the foot of the Lamp. Tho Norman Electric Light Co. has at last succeeded m completely realising this ideal of Electric Lighting, and there is no doubt that this moßt important invention will bring about a complete revolution m all branches of lighting. Our Electric Lamp needs neither Ma' chincry, Conductors, nor any expensive out 1 lay, and is neither complicated nor disagree able m manipulation ; all that is neces sary is to refill it every four or five dayi with acid. The cost of lighting will b< as cheap as gas (3£ cents per hour) and it has before the latter the im mense advantage of neither producing heat smoke nor carbonic acid, owing to which thi air is not impured, and remains at the sanu degree of temperature. It is, further, abso lutely inodorous, and does not need to b< kindled by match or otherwise, but simply bj turning the key, thus avoiding all danger ol fire, explosion or suffocation, as m the caseoi gas, if the icy U lert open ; and it must b ( conceded that this advantage alono ia lU' valuable. It i 3 further preferable to an) known kind of lighting for the following reasons : — 1. Its manipulation is so simple that anj child can keep it m order. 2. 1 hat the Lamp is portable, and can be removed like any Oil i-ainp from ono pluce to another. 3. That it neither requires tho disagreeable fixing of tbe wick or the cleaning of tin cylinder, as m tho case of Oil Lamps. 4. That the light produced is a soft and most steady one j thut it never fiickers, and (he flame, though being equal m power ol lighting to gas, can be regulated u> any degree. 5. 