FORA MINI PER A . 



the fossil state in chalk, limestone, and other mineral 

 deposits. From sea-soundings they may be procured by 

 dissolving out the tallow in which they are collected, by 

 means of benzine any sort of benzine or benzoline serving 

 this purpose. To obtain fossil Foraminifera from chalk, 

 the pieces must be broken up small by means of a hammer, 

 and then gently crushed in an iron mortar. The powder is 

 then to be placed in a piece of coarse calico, tied up like a 

 pudding, and put into a large basin of water, and well 

 kneaded, until reduced to one-third its original bulk. The 

 milky fluid is then to be poured off, until only one-fourth 

 remains, and the operation of washing, by stirring up with 



FIG. 127. 



fresh water, and allowing to settle, repeated many times, 

 until a portion of the residue, on examination under the 

 microscope, shows that most, or all, of the extraneous 

 matter has been eliminated. 



