-1C 
the dominance of the species over maple, its nearest com- 
petltor in the forest. On account of this tolerance, 
suppression at eome stage of its earlier growth is the rule 
rather than the exception. 
The tree usually seeds at intervals of every & or 
3 years, and in spite of reduced fertility, many more seedlings 
start than are able to mature, even though they are not notice¬ 
ably abundant, us in the case of the maple. The production 
of seeds and seedlings is therefore not the critical fuetor 
in the regeneration of either species. 
The species is extremely sensitive to sudden changes 
in the density of the forest, and seedlings respond quickly 
in rate of growth to alight increases in the amount of light 
admitted, but they are killed by too much light, and therefore 
the tree will not take a central position in an open vyiridfall 
unless it is sheltered by fast'er growing species. On account 
of its shallow root system, it is very susceptible to surface 
fires. 
ACKR SACCHaKUM (sugar maple). - This species, as it 
occurs in the hemlock climaK, is tall and slim and free of 
limbs except near the top. The trees are apparently healthy, 
though all of them have undoubtedly suffered more or lees 
suppression. As already noted, the seedlings occur in such 
numbers that a superficial observation might lead one to 
