HOUSING AND CARE OF COWS 89 



In summer, mosquito netting — with larger meshes — will give 

 better ventilation. 



Some farmers are using cheesecloth the year round on their 

 "barns on all windows — having discarded glass altogether — and, it 

 is said, with good results, even in very cold weather. The cheese- 

 cloth ventilation certainly proves satisfactory in comparatively mild 

 climates (as the Pacific coast) and is at once so simple and cheap 

 that it may here well supplant the King system and is worthy of 

 trial in colder climates in barns lacking other or satisfactory forms 

 ■of ventilating systems. 



The last word has not been said on stable ventilation by a great 

 •deal. Ventilation is a very complex and difficult problem unless one 

 can produce a forced draught of warm or cold air by blowers, as 

 is now done in large public buildings. It has been taught that the 

 impure air (C0 2 ) falls to the floor in stables and is thus removed 

 by the King system. This is not entirely true, as there are all sorts 

 ■of currents and counter currents in barns. 



One fact is certain, warm air rises. In the dwelling-house 

 warm, fresh furnace-heated air rises and the air containing most 

 C0 2 falls to the floor. In the stable the warm air is furnished by 

 animal heat and the animal emanations must rise to some extent 

 with the warmed air. 



If there is only a ventilator on the roof this may allow some 

 warm, vitiated air to escape, but then the current may be reversed 

 by wind pressure and cold air descend. A simple way of securing 

 a constant circulation of air is the Rutherford method, which has 

 been in use for 14 years and is installed in the Dep't of Agriculture 

 buildings at Ottawa. The arrangement is shown in the accompany- 

 ing sketch.* The inlet is seen at E, D and C, — a U-shaped pipe 

 or box laid in the ground, the deeper the better. 



The intake is at E under the covered outside end of the box, 



* Hoard's Dairyman, June 5, 1908. 



