Medicine Looks Ahead 249 



ous germs, which survived, and killed them with a club in the 

 backyard." 



After Pasteur and Koch discovered the first disease germs, 

 progress was made in teaching people the importance of a 

 pure water supply. England and Germany led the way in 

 water purification and in the early 1900*5 American cities 

 finally began to follow suit. Today people fully realize the 

 dangers of typhoid and know that a system of purifying the 

 water and treating the sewage is vital in preventing an epi- 

 demic. 



In war-torn areas where the water supply and sewage sys- 

 tems of cities have been destroyed, the typhoid fever menace 

 is ever present. In all wars prior to the first World War ty- 

 phoid generally proved more deadly than shot and shell. The 

 use of typhoid vaccine checked this disease in the first World 

 War and has proved highly effective since then. The vaccine 

 consists of dead typhoid germs. The injection of these germs 

 causes the formation in a person's blood of so-called antibod- 

 ies, which protect the individual against the live germs. 



Our fighting men are guarded against typhoid, yellow fever, 

 and several other diseases by "shots in the arm." Sanitary 

 methods of sewage disposal, water purifiers, and great care in 

 the preparation of food also protect the men in our armed 

 services against dysentery and other diseases. 



The Ammo Acids Promote Health and Beauty 



Your hair, nails, skin, soft tissues, and many vital secre- 

 tions of your body are composed mainly of protein. And 

 these proteins are made up of smaller "building blocks" called 

 amino acids. Twenty-three of these acids are known today. 

 Scientists believe these acids play an important role in many 

 ailments. Experiments with animals have proved that the lack 

 of one amino acid, tryptophane, causes animals to get bald 



