A Christmas-tree looks very pretty when lighted by a hundred incandescence lamps; the first attempted being in all probability that in the Swedish section of the Electrical Exhibition held in Paris two years ago. At the Vienna Electrical Exhibition there are, while we write, some novel effects of electric illumination; for instance, there is a hall lighted entirely from the ceiling by electricity. The ceiling is painted a deep blue to represent the sky, and studded with innumerable stars in the shape of incandescence lamps. This reminds us of the allegorical sun produced in the window of Mr Mayal, the well-known photographer, by means of the same illuminant. From its cool brightness and safety from fire, the incandescence light is very well adapted for theatres, and there are now several opera-houses and theatres lighted by it. The Savoy Theatre, London; the Princess’s Theatre, Manchester; the Lyceum Theatre, Edinburgh, &c., are all lit by incandescence lamps owing to its brilliance as compared with gas. Some change was necessary in the making-up of the actors and actresses, and the painting of the scenes; but at the New Grand Theatre, Islington, the changes have been avoided by the use of yellow glass bulbs which soften the light. At the Electrical Exhibition, Vienna, there is a model theatre with numerous scenic effects never before attempted by gas; and moonlight, sunrise, sunset, twilight, and night are all imitated with great fidelity. In the drama of _Love and Money_ at the Adelphi Theatre, a flood of daylight bursting in upon some entombed miners through a hole cut in the coal by a rescuing party was very well imitated by a beam of ‘arc’ light. The practice of wearing tiny star lamps on the hair or dress has also come more into fashion. Probably the first use of it was by the fairies in the comic opera of _Iolanthe_ at the Savoy Theatre. Each fairy carried a small accumulator on her back half concealed by her wings, and this gave electricity to a miniature Swan lamp mounted on her forehead. Ladies are sometimes to be seen with miniature lamps attached to their dresses, and lighted by a touch of their fingers upon a small key hid in their belts. One might have glowworm or firefly ornaments at this rate. The ‘death’s-head’ pin worn by gentlemen in Paris a year or two ago was a similar application of the electric current. On touching a key to complete the electric circuit of a small pocket battery, the eyes of the death’s-head in the wearer’s breast began to shine like sparks of fire. The use of the electric light for sporting purposes has had some curious developments. Polo, cricket, base ball, skating, and so on, have all been played by night. At the Montreal Ice Carnival last winter, the huge ice palace was illuminated both out and in with thousands of electric lights, and skating, curling, snow-shoeing, and toboganning went on by night as well as day.