PREFACE. XI 



These doors are bright, circular, and thick, of 

 very peculiar construction, having taken much 

 time and labour to bring to perfection. A spirit 

 named Science opens them to all who seek her, 

 and feel induced to enter her domains. At the 

 end of the tunnel we find other portals, much 

 smaller, and more carefully constructed, and two 

 or three in number ; when these are opened, we 

 are in the new world spoken of. And now I 

 see your astonishment : your minds are bewil- 

 dered with the variety of new beings and forms 

 you behold, all gliding and moving about without 

 noise and at perfect ease. 



Now let me direct your attention, first, to the 



