n6 MINUTE MARVELS OF NATURE 



Nature. For the tenants of these fantastic abodes 

 are but other kinds of zoophytes, which hold an 



Fig. 75. A very thin and minute portion of limestone, 

 showing how it is built up of tiny 1 ving forms 



intermediate place between our own tiny British 

 species and those organisms which have built up 

 thousands of " coral-reef " islands in the Pacific 

 Ocean, extending in some instances hundreds of 



