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10 McIntosh battery and optical co., Chicago, ill., c. s. a. the body of the lantern affords a large air chamber to which fresh air has free access, while the open space about the chimney permits an extra draught in addition to that fur- nished by the chimney itself. We have expended hundreds and hundreds of dollars in our endeavor to bring before the public an oil lantern that was satisfactory. We have succeeded, and at last it is an established fact. Especial attention is called to the excellent ventilation whereby perfect combustion is secured and an accumulation of heat prevented. It is impossible, with reasonable care in first lighting up, to cause cracking of the condensers from heat, the ventilation being arranged to draw the column of hot air back or away from them. This lamp ourns with a brilliancy hitherto unsurpassed; it is easily filled, trimmed, and kept in order. The chimney is made of metal throughout; immediately in front of, and also behind the light, there is an opening for the light to pass to the condenser and reflector. These openings are covered with plates of the highest grade of thin annealed glass of peculiar shape, manufactured expressly for this purpose. This glass is so thin that the amount of light obstructed by it is imperceptible ; it is tough, and practi- cally unbreakable except by sheer carelessness. Each glass is easily removed and is entirely independent of the other; the body of the lamp being attached to the fount with a hinge, renders each and every part easily accessible. The reflector is made after the most approved pattern, and is finely nickel-plated. It is attached to the outside of the chimney, and is protected