METHOD OF MOUNTING 49 



tion of common washing soda until separated 

 into tiny particles. Strain off and keep back 

 the sediment, the object being to get rid of 

 any trace of carbonate of lime and to keep 

 the tiny polycystina shells. These must be 

 washed several times and then put into a test- 

 tube with nitric acid and boiled for half an 

 hour to remove any possible appearance of lime. 

 Again they must be removed and repeatedly 

 washed in water to get rid of the nitric acid. 

 They are then ready for mounting, and should 

 be bottled in distilled water until required.' 

 This is Mr. Martin J. Cole's method of mount- 

 ing them, and it cannot be excelled. 



When a number of these fossil forms 

 are placed under the microscope, they will 

 be found to be a thing of beauty and a joy 

 for ever. 



It is no exaggeration to say that sermons 

 have been preached which have been prompted 

 or suggested by a microscopic view of these 

 matchless and exquisitely beautiful organisms 

 part of Nature's building material. And why 

 not ? Nature is the ' other book,' and the more 



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