PROTOZOA AND ALCOHOL 



53 



this group, the cells may be naked or may possess a haul 

 mineral covering ; a second group of Protozoa are pro- 



• 



vided with one or more long, wavering threads called 

 flagella (Ha-jel'la : Latin, flagellum, whip), and have the 

 name Flagellata ; the flagella are longer than cilia and 

 exhibit more complicated movement. A third class, 

 known as Infusoria (in-fu-s<Vri-a), includes most of the 

 common Protozoa found in protozoan cultures. Most of 

 this class are provided with cilia. 



LABORATORY STUDY OF PROTOZOA 



Take a drop of water from an infusion rich in Protozoa ; place on 

 a slide and examine with a 16 mm. or J objective. Answer the questions 

 suggested by the report. 



37. Protozoa and Alcohol. — Scientists have studied tin- 

 relation of alcohol to the life processes of Protozoa. Nor- 

 mally, such Protozoa as paramcecia divide a regular 

 number of times each day. When a small amount of 

 alcohol is placed in water containing paramcecia, the 

 normal rate of fission is diminished. Professor Wood- 

 ruff has shown by an extended and critical study that 

 alcohol tends to prevent paramcecia from dividing as 

 many times as they would under normal conditions. 

 This means that alcohol hinders the growth of paramcecia. 



