Bui, 193, Bureau of Plant Industry, U. S, Dept. of Agriculture. 



Plate IV, 



Fig. 1.— Formation of Kalmia Peat, Third Layer. 

 Oak leaves 2 years old. (Nattiral size.) 



Fig. 2.— Formation of Kalmia Peat, Fourth Layer. 



Kalmia leaves '2 years old. (Natural size.) 



