Bul. 820, U. S. Dept. of Agriculture. 
. sa seecsatette men 
(essen: oes 
PLATE VII. 
F-64786 
Fic. 2.—FIFTY-FIVE-YEAR-OLD STAND ON PURE SAND, 
F-64793 
Fig. 1.—FORTY-FIVE-YEAR-OLD STAND ON CLAY SOIL, 
SHOWING WELL-CLEANED BOLES. 
IS TYPICAL OF GOOD 
SHOWING UNDERBRUSH WHICH 
inning out and growth 
ill, 
HUBBARD COUNTY, MINN. 
Also trees th 
Note lack of undergrowth on sandy site. 
SOILS WHERE THERE HAS BEEN NO FIRE. 
at a standst 
DENSE STANDS OF JACK PINE ON CLAYEY AND SANDY SOILS. 
