Hygiene is the science of health. Nowadays, surrounded as we are by every sanitary convenience, it is hard for us to realize that only for the past hundred years or so have men grasped the importance of studying hygiene. This is due largely to the fact that it could progress only hand in hand with medicine which has made its rapid strides during the last century. But while medicine aims to cure disease, hygiene aims to prevent it. Hygiene falls into three natural groups: hygiene of the community, of the home, and of the individual. .