52 



THE SMALLEST LIVING THINGS 



In this brief review of the smallest living things belonging 

 to the vegetable kingdom it is necessary to choose somewhat 

 arbitrarily from the enormous mass of material found in text- 



rig. 23— A TYPE OF ARBOROID COLONY OF THE YELLOW 

 FLAGELLATE, HYALOBRYON DEFORMANS 



Here the daughter individuals which are formed by division attach 



themselves to the outside of the parent cup and there secrete 



their own cups 



From a drawing by M. Valentine after Lauterborn 

 Magnification, 800 



books and monographs.* I shall select only those forms which 

 strike the eye of an observer using a microscope. For the most 

 part these fall in the classes Isokontae, Chrysophyceae, Bacil- 

 lariales, Cryptophyceae, Dinophyceae, and Euglenineae of the 

 eleven classes listed on page 49. 



* For complete treatment, consult Engler and Prandtl, Naturlichen Pftans- 

 enfamilien, or West and Fritsch, British Fresh-water Algae, and special mono- 

 graphs on desmids, diatoms, dinoflagellates, and the like. 



