HOG HOUSES AND PENS 453 



natural stream, water pumped from a well by a wind- 

 mill or other power, can supply the need. "A clean 

 mud wallow is enjoyed more by swine in the summer 

 time than any one other condition that may be furnished 

 them. It keeps them cool, destroys lice and keeps the 

 skin in a good healthy condition." 



In the first illustration at the beginning of this ehap- 

 ter is shown the exterior of a hog house at the Illinois 

 experiment station (Bulletin No. 109), constructed with 

 such ideals in mind, and described by Mr. Dietrich : 



"The building as a whole is 30 feet wide, with an 

 eight-foot alley running lengthwise through the middle, 

 between two rows of pens. It stands lengthwise east 

 and west, with the windows on the south. The important 

 factor to consider in this connection is the height of the 

 windows represented at E and D in connection with the 

 width and manner of construction of the building. The 

 window E is so placed that at noon of the shortest day 

 of the year, the ray of light which passes through tlie 

 upper part, will fall upon the tloor of the south side pen 

 on the opposite side from the window. This allows the 

 total amount of light coming through the window at 

 this season of the year and this time of the day to fall 

 upon the floor within the pen. In the morning and in 

 the afternoon, when the sun is not at its highest point, 

 a part or all of this beam of light will pass beyond the 

 pen. Consequently, during the later winter months, there 

 will be a maximum amount of sunlight on the floor of 

 the pen. 



"The lower ]:)art of the window D in the upper part 

 of the building performs the same function for the pen 



