216 Kepoet of the Chemical Deparimknt of the 



King is manufactured by the Standard Paint Co., New York and 

 Chicago. On the inside a layer of matched sheathing is nailed 

 to the studding, then strips of inch furring two inches wide, to 

 which are nailed two thicknesses of matched sheathing with 

 paper between. The outer air space between the studding is 

 filled with sawdust or similar material, and the spaces left by 

 the furring are closed air-tight at the ceiling and floor. (See 

 Plate VII.) 



(5) Gelling and floor should also consist of two thicknesses of 

 matched lumber with paper between, and joints made at corners 

 should be very tight. 



In constructing curing-rooms two things should be kept in 

 mind: First, that the walls should be as nearly air-tight as possi- 

 ble in order to keep out the warmer air outside, and, second, 

 that the walls should be poor conductors of heat. It is advan- 

 tageous to cover the inside walls with two coats of shellac. 



(6) Yentilating flue in ceiling. — It is desirable to provide a tight 

 ventilating flue in the ceiling of the curing-room, extending 

 above the roof. Its diameter may be six or eight inches. It 

 should be provided with a damper. (See Plate VIII, H, I.) 



(7) Methods of Gontrolling temperature and moisture in cheese 

 curing-rooms placed above ground. — After constructing a proper 

 curing-room, it is essential to provide arrangements for control- 

 ling temperature and moisture. The construction of a curing- 

 room is only a partial means toward this end. The following 

 methods have been found effective in keeping the temperature 

 during summer between 58° and 70° F. and at the same time 

 modifying the moisture content of the air favorably: (a) Ven- 

 tilation by air forced through horizontal sub-earth ducts or deep 

 vertical sub-earth ducts and wells, (b) Ventilating over ice. 

 (c) Evaporation of water. 



Plate VIII illustrates the construction of a horizontal sub- 

 earth duct, which should be 12 feet or more below the surface 

 of the ground and 100 feet or more in length. It is recom- 

 mended that the sub-earth duct consist of three rows of 10-inch 

 drain tile laid side by side at the bottom of the trench, or the 



