it begins to set and this covering

should be left on for at least thirty-six hours. Some objection has been raised to concrete floors on account of their being too cold in severe weather for cows to stand or lie upon. This objection may be overcome by covering the stall floor with Cork Brick, set in the concrete, which provides a surface as impervious to water and as easy to keep clean as the concrete itself. After the levels have been established, the drain tile can be laid and the drains and traps set at correct heights. The main floor level having thus been determined, the levels of the gutter floor, stall bed, manger and feeding floor can be easily obtained, being indicated by the use of sticks or by marking the walls. Floor Level It is important to get the right floor level. The dirt should be levelled off, cutting it down where too high, and filling in where too low, wetting and tamping until a hard surface is obtained. It should be noted that the cleaning, or litter alley floor, both where the cows face in and out, is on a level with the top of the door sill, or 6 in. above grade. The established ground floor level will, therefore, be 6 in. below the door sill if the floor is 6 in. in thickness. By referring to pages 140 and 141, showing sectional diagrams of dairy floors, the various arrangements, measurements, and levels may be noted. Curb The curb is the first part of the floor to be built. Make it 6 in. high above the cow platform, and 6 in. wide. If STAR Curb Clamps are not used, the stalls should be assembled, set up, and plumbed true and straight in the curb form before the curb is poured. Drainage Grades The litter and cleaning alleys should have a slight pitch toward the gutter. Where a high feed alley floor is used the floor should pitch toward the manger. There should also be a certain amount of slope in the length of manger and gutter. These pitches in most cases being slight, the variation in grade can be made in the level of the dirt floor or by varying the thickness of the concrete floor. Cow Bed After the manger, the cow bed or platform is put in. This should be about 4 ft. 6 in. long for Jerseys, Guernseys and Ayershires. A platform 4 ft. 8 in. to 4 ft. 10 in. is recommended for Holsteins and Durhams. Twenty inches back from the curb, an elevation of 3/4 in. should be put in to hold the bedding in place and pro-vide a foothold for the cow when rising. From this point, the cow bed should slope toward the gutter gradually 1/4