Bui. 27, Porto Rico Agr. Expt. Station. 
Plate II 
Fig. I.— Hill of Potato Yams; Weight, 12.5 Pounds. 
Fig. 2.-Potato Yams; Large Versus Small Seed Tubers. Pile on Right, 
Seed Weighed 135 Grams; On Left, 45 Grams. 
