ALCOHOL, NARCOTICS, AND THE HUMAN MACHINE 393 



What Fatigue Poisons Do. You have all found out that 

 you cannot work as well when you are tired. This is due 

 to the fact that as we overuse the body cells, more and 

 more waste products are formed and are not taken away 

 as quickly as they should be. These wastes are poisons 

 and as they accumulate in the body cells, they soon give 

 us a feeling of fatigue. No one can do his best work when 

 fatigued, and the fatigue poisons in time do great damage 

 to the body cells. Especially is the nervous system 

 damaged by poisons. 



Demonstration 5. Effect of Cigarette Smoke upon Fish. 



Prepare a cigarette smoker as follows : Heat the end of a glass 

 tube and insert the end of a file and ream out the end, making it 

 flaring so it will hold the end of a cigarette (A). Bend the tube 

 to make a narrow loop. Connect the other end at C to a tube 

 going nearly to the bottom of a Florence flask. Fill this flask 

 just over half full of water and put a goldfish in it. Connect the 



flask to a two-liter bottle (E) by means of tube D. Fill E with 

 water and arrange tube to siphon water out of E. By opening 

 clamp F and blowing into A, the siphon tube is easily filled. Close 

 clamp. Insert cigarette at A. Open F and light the cigarette. 

 As water runs out of E, smoke will bubble through the water W, 



