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2 MCINTOSH BATTERY AND OPTICAL CO., CHICAGO, ILL., U. S. A. Microscopists find frequent use for the solar and oxy-hydrogen light, especially when spending many hours daily in original inves- tigation. It enables them to study many processes on a larger field, giving the relation of parts, and economizes time, aside from the con- venience of being able to demonstrate to all observers the work done. Lecturers, whether engaged in instructing the public through the medium of lectures on natural science, or furnishing intellectual amusement suited to a promiscuous audience, thoroughly appreciate the benefits accruing from the use of the Stereopticon with a suitable selection of slides. The public never tires of good pictures and now that the art of photography has developed methods by which the amateur can easily learn to make his own lantern transparencies, a good Stereopticon is a most profitable investment for those who are engaged before the public. Sunday Schools may not only be amused and interested, but religious instruction may be impressed upon the hearts of young and old in a most effective manner by a Stereopticon in the hands of a judicious Pastor or Superintendent. The illustrated Sacred Hymns, especially, form the most touching and beautiful exercise that can be imagined. Some of our leading Pastors use this instrument constantly to illustrate the Sunday School Lessons. Temperance Societies find in the Stereopticon an invaluable aid in exciting interest in this subject which so large a proportion of the public regard as hackneyed and tedious. So extensively is this realized abroad that the most exquisite and varied lecture sets bearing on Temperance have been prepared, many of which have never been introduced into this country. Bands of Hope, Juvenile Humane Societies, etc., which are designed for the benefit of children need every resource for im- parting amusement and instruction, judiciously intermingled to keep up the interest of their members. In the Stereopticon they possess the very elements needed for this purpose. Lodges, Granges, Grand Army Posts and all other Societies of a similar character, make considerable use of the Stereopticon as an attractive and economical means of illustrating their rituals or con- tributing to the interest of their entertainments. Insane Asylums and other Public Institutions where those mentally or physically enfeebled are cared for, find the Stereopticon an endless source of interest; the minds of the patients can be directed to any subject thought desirable, by properly selected pictures. Parlor Entertainment. The Sciopticon affords a never failing source of amusement in the family. Impromptu exhibitions are well