22 
BULLETIX 510, U. S. DEPARTMENT OF AGBICULTUEE. 
Fig. 20. — Sketch of a concrete foundation pier in use in 
a mill yard in 'Mississippi. It is cast in two sections, 
for convenience in aligning and moving about the yard. 
that clean clay or sandy soil will serve the purpose admirably. "While 
sandy soil allows fungi to spread within it more rapidly than clay. 
it offers the advantage of rapid seepage, and where the surface is 
amply ventilated no 
difficulty should be 
experienced. (PL X, 
figs 1 and 3.) 
The principal need 
is to have the yards 
so laid out that sur- 
face water will not ac- 
cumulate. Ordinary 
ashes are not consid- 
sidered a good filling 
or surfacing material, 
since they absorb 
moisture readily and 
hold it tenaciously, 
particularly w h e n 
they are in a finely pulverized condition. Less finely divided mate- 
rial, such as coarse cinders, gravel, or slag, is better adapted on 
account of the rapid seepage. Moreover 
appear to grow 
through ashes quite 
readily when they 
are in a moist condi- 
tion. In fact, the 
writer has a record 
of one case where 
fungi developed lux- 
uriantly in a pile 
of ashes in the open 
w h e n exposed to 
prolonged rainy 
weather. (PL IX, 
fig. 3.) 
METHODS OF STACKING 
LUMBER. 
wood-destroying fungi 
Lumber piled in 
the open must be al- 
lowed ventilation 
around the individ- 
ual pieces, and this 
Fig. 21. — Pecky cypress foundations in use at a mill in 
South Carolina. Each large square contains from 500 to 
GOO board feet. This type of construction does not 
allow sufficient ventilation beneath the piles. 
is usually arranged 
for in storage practice. 
In some instances, however, this necessity is ignored in certain 
