36 DROPS OF WATER. 



" The shell-like coverings (loricce) are found in 

 large masses, covering many miles of the earth's 

 surface, and occur, when indurated and mixed 

 with argillaceous and other earths, in the form 

 of siliceous rock, slate, &c. These remains of 

 the primeval inhabitants of our globe are re- 

 cords in the pages of history, penned by Infinite 

 Truth, unbiassed by ignorance and prejudice ; 

 and form some of the first-fruits of the effective 

 application of achromatic glasses in our micro- 

 scopes." "It is hardly possible to take up and 

 examine a dozen flints without discovering spe- 

 cies of Infusoria enclosed within them. These 

 may be seen under the microscope, when very 

 thin sections are made/ 3 



As flint is used in the manufacture of glass, 



