Bui. 561, U. S. Dept. of Agriculture. 
Plate IV. 
Fig. 1.— Pen 9, Mixed Pen of General-Purpose Breeds. 
On free range; not fed any beef scrap. 
Fig. 2.— Pen 15, White Leghorns and Barred Plymouth Rocks. 
On free range, fed one-third cottonseed meal in mash. 
