PREFACE. 



results with little trouble, I have concluded to omit 

 1/n> gs, which would increase the bulk of the Manuul, 

 without a corresponding addition to its usefulness. 



PREFACE TO FIFTH EDITION. 



THE lime light, in an improved form, having been in- 

 troduced into the Sciopticon, it has become expedient to 

 append to the Sciopticon Manual, a description of the 

 apparatus and directions for its use. 



The demand for Lantern projections is steadily on the 

 increase. A fine photograph (arid what can be finer?) 

 projected upon a largo screen, before a thousand spec- 

 tators, gives, it is safe to say, ten thousand times the 

 satisfaction that one alone with his stereoscope receives 

 from it. The appreciation is cumulative. "The more 

 the merrier," is the philosophy of it. 



The Sciopticon with its oil lamp, rather than with its 

 lime light, continues to be the choice of the many, be- 

 cause its use is convenient and inexpensive. There are 

 purposes and occasions however for which the lime light 

 is a necessity. The gas therefore has now received its 

 full share of attention. Much of the added matter is 

 intended to assist those who have a Sciopticon, to pro- 

 vide themselves with interesting objects for exhibition, 

 without resort to a large assortment of exoensive slides. 



