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LETTEllS ON NATURAL MAGIC. 



dicular to the middle of it as the other is to the other side, 

 they will see each other but not themselves. If we now 

 suppose M C, C D, N C, C D to be the partitions of two 

 adjacent apartments, let square openings be made in the 

 partitions at A and B, about five feet above the floor, and 

 let them be filled with plate glass, and surrounded with a 

 picture frame, so as to have the appearance of two mirrors. 

 Place two mirrors E, F, one behind each opening at A 

 and B, inclined 45 to the partition M N, and so large 

 that a person looking into the plates of glass at A and B 

 will not see their edges. When this is done it is obvious 



Fig. 3. 



that a person looking into the mirror A will not see him- 

 self but will see any person or figure placed at B. If he 

 believes that he is looking into a common mirror at A, 

 his astonishment will be great at seeing himself trans- 

 formed into another person, or into any living animal 

 that may be placed at B. The success of this deception 

 would be greatly increased if a plane mirror suspended 

 by a pulley could be brought immediately behind the 

 plane glass at A, and drawn up from it at pleasure. The 

 spectator at A having previously seen himself in this 

 moveable mirror, would be still more astonished when he 

 afterwards perceived in the same place a face different 



