62 BULLETIN 24, U. S. DEPARTMENT OF AGRICULTURE. 
planting. Clear cutting and eradication of undergrowth and useless 
trees is necessary in any case. To insure natural reproduction seed 
trees must be left and the soil prepared for the seed. On situations 
unfavorable to natural reproduction cottonwood must be planted. 
Planting, in fact, will probably be necessary to supplement natural 
reproduction over large portions of nearly every extensive bottom- 
land tract. Artificial reproduction is but little more costly than 
natural, and since under it results are much more certain, it may 
often be advisable to employ it exclusively. 
O 
