76 



BIOLOGY AND HUMAN LIFE 



beginning student; but from the examples given in each section you 

 should be able to get a rough notion of where any specimen belongs. The 



best way to use these 

 tables is to refer to 

 them whenever a new 

 plant or animal comes 

 to your notice, in order 

 to get an idea of the 

 general position of 

 the new species in the 

 whole scheme. By us- 

 ing the diagrams and 

 the tables in this way 

 you will soon become 

 familiar with the main 

 branches and the more 

 important classes. As you become acquainted with more plants and 

 animals you will probably want to use a more complete classification. 



Fig. 38. Euglena 



/ 



This one-celled alga is capable of moving about by 

 means of the swimming lash, like many animals; it 

 has chlorophy], like many plants. Near the base of the 

 lash is a reddish speck which is sensitive to light. Al- 

 though it is often called an eyespot, it is no more like 

 an eye than a grain of powder is like a cannon 



B 



Fig. 39. Mold fungi 



A : In the black molds, reproductive cells (spores) are formed by the repeated di- 

 vision of the protoplasm in an enlarging cell at the end of a thread. When mature, 

 the inclosing wall breaks and the spores are scattered. B : In the blue molds, spores 

 are formed by the successive separation of terminal portions of the branched threads. 

 This is a type of fungus used in ripening Camembert cheese 



