Bul. 974, U. S. Dept. of Agriculture. PLATE XII. 
FIG. |1.—BLUEBERRY PROPAGATION FRAMES SHADED WITH MUSLIN. 
Each sash is of the standard size, 3 feet wide and 6 feet long. The wooden sides of the cold- 
frames rise 2 feet from the ground at the back and 1 foot at the front. The lowest part of 
the roof joists is 63 feet above the ground. 
Fic. 2.—BLUEBERRY PROPAGATION FRAMES WITH SLAT SHADES. 
Each sash has a separate, removable cover of builders’ lath. The laths are separated from 
each other by a distance equal to the thickness ofa lath. The posts shown in the illustra- 
tion and the framework supported by them were originally made to carry muslin shades. 
They are not needed when slat shades are used. 
