BARN ventilation is a necessity.

It is just as essential that stock should be supplied with an adequate amount of fresh air every 24 hours as it is that they should be supplied with food and water it is even more necessary, as pure air is not only essential but vital. We are too apt to reverse the order because of being under the necessity of providing the food and water at whatever expense, whereas pure air is an ingredient that automatically comes into the building and we get the impression that all we have to do is to open a door or a window or a sufficient number of them and it will be supplied without any especial effort on our part. The very reason that this erroneous idea prevails explains why, in the majority of cases, so little thought is given by the man who builds a barn to the important subject of ventilation. In some cases, farmers do give thought to the subject and try to work out a system of ventilation of their own with the usual result that it proves unsatisfactory. Now, almost any system of ventilation is better than no system, but there is no reason why the best should not be had when it can be obtained at as little cost as something far inferior. The matter of barn ventilation is not complicated or difficult to understand. There are only three factors that enter into it—the area-tors or cupolas, the fresh air intakes or flues and the foul air out-takes or flues. When these three are installed in the right relationship to each other and of the proper size, then the correct system of ventilation is bound to result, which means that a constant supply of pure, fresh air will be taken into the barn and the foul air, laden with impurities and moisture, will be removed from the barn and not only will the stock be supplied with an abundance of pure air, but the barn itself and its contents, other than stock, will be kept in a dry, clean and healthful condition. The dairyman is most interested in getting the largest amount of milk yield possible. It goes without saying that in order to do this, Page One Hundred Fifty-six