61 ^(57^ JAC^GS l^JAV 



A man can live forty days without food and seven days without water. 



He can hve but a few minutes without AIR. 



A cow can hve longer than a few minutes without PURE air; but the 

 more impurities there are in the air she breathes, the greater will be the t2ix 

 upon her health and upon her ability to produce milk — the greater will be the 

 tax upon her vitality and upon life itself. In poorly ventilated barns, the air 

 is breathed over and over again, and becomes poisonous; cows in such a stable 

 become less able to resist disease, and cannot recover from diseases as easily. 



Air, water and food are the three great essentials of life, and of the three 

 AIR may fairly be considered the most important, because it is the FIRST 

 great life-sustaining element for all animals. 



How necessary pure air is to life and to the maintaining of vitality and 

 energy is well illustrated by many interesting items cited by writers on the 

 subject. 



Near Naples, Italy, is the famous Dog Grotto, which is filled to a certain 

 height with carbon dioxide, the same element that is thrown off by the lungs. 

 So powerful is this carbon dioxide, or rather so powerful is the lack of oxygen 

 because of its presence, that a dog brought into the grotto is rendered insensible 

 within a few minutes. This experiment is often performed, on payment of a 

 small fee, for the amusement of travelers. 



The effects of breathed air have been frequently tested in schools where 

 for a short time the ventilation had been cut off. The pupils at first complained 

 of being cold, and it was found necessary to raise the temperature from 70° 

 to 80° Fahr. before the occupants of the room were warm. This no doubt 

 was due to the reduction in vitality owing to the impurity of the air and a lack 

 of oxygen in the lungs. After the ventilation had been cut off for twenty or 

 thirty minutes, the pupils began to complain of headache. 



Everyone knows how quickly impure air in a room — a church or lecture 

 hall, for instance — will cause a person to become sluggish and drowsy, and 

 how it destroys energy. 



In our histories at school, we used to read of the Black Hole of Calcutta, 

 where, in 1756, 146 prisoners were confined in a cell 14 ft. 10 in. by 18 ft., 

 having but two small windows — all but 23 dying during the night, for lack 

 of oxygen. 



How Much Air Does a Cow Need? 



One writer vividly illustrates the vital importance of PURE air to the 

 animal by pointing out what a task it would be to carry fresh air to a cow in 

 a 3-gaIlon pail, as one might carry water. To supply a cow in this way, 



