10 
BULLETIN 1445, U. S. DEPARTMENT OF AGRICULTURE 
standards. Variations in colors are so wide and so important that 
separate standards have been made for them. Practical forms have 
been made for the following colors: (1) White cotton, (2) yellow 
Fig. 3. — Staple lengths. Photograph of samples representing 
the official standard for nine selected lengths of staple 
tinged, (3) yellow stained, and (4) blue stained. Three other color 
types are used in the trade, but no practical types are prepared for 
them. They are {a) spotted, which comes between white and yellow 
