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



Plate V. 



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

 Mixed oak and kalmia leaves 3 years old. A few live rootlets of oak are shown. (Natural size.) 



Fig. 2. -Formation of Kalmia Peat, Sixth Layer. 



Mixed oak and kalmia leaves 4 years or more old interlaced with live rootlets of oak and kalmia 



(Natural size.) 



