MAISASDM.METOALJ 



5 



^Ty' 



THOUGHTS 



ANIMALCULES; 



OR, A GLIMPSE OF THE 



INVISIBLE WORLD 



REVEALED BY THE MICROSCOPE. 

 BY 



GIDEON ALGERNON MANTELL, ESQ., LL.D., F.R.S., 



AUTHOR OF THE "WONDERS OF GEOLOGY," ETC. 



THE PHYSALIA PELAGICA, page 



" In the leaves of every forest — in the flowers of every garden— in the waters 

 of every rivulet— there are worlds teeming with life, and numberless as are the 

 glories of the firmament." 



Dr. Chalmers. 



LONDON: 

 JOHN MURRAY, ALBEMARLE STREET. 



1846. 



