1 6 MINUTE MARVELS OF NATURE 



Fi^, 8. Chains of diatoms in their natural state adhering 

 to a larger microscopic alga, magnified 



life, but remain attached, and form chains of 

 somewhat oblong or square frustules, each ad- 

 hering to the other at the corners, the chains ulti- 

 mately being fastened to, or intermixed with, other 



