242 
Journal of Agricultural Research 
Vol. XI, No. 5 
invasion of other plants. The mycelium after a few years dies, leaving 
the soil still more enriched and no longer impervious to water. 
The first stage in the succession on this bare area is (i) an early-weed 
stage, followed by (2) a late-weed stage. This is followed by a (3) short¬ 
lived grass stage, and this by a (4) perennial stage, which gives way to 
the (5) original short-grass cover. 
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