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POPULAR SCIENCE REVIEW. 
branches of the tree be broken off by the high winds of 
winter, and when spring comes they will attract the sap which 
went to those branches to themselves. This will arouse their 
dormant energies so powerfully that they will force their way 
through the wood and bark to the surface, though that wood 
may be the growth of years. The bud which has slept in a 
condition of feebleness, perhaps for half a century, will break 
forth at last into a powerful branch, the injury done by the 
hostile forces of nature will be repaired, and the tree will carry 
on successfully the battle for life. 
All must be familiar with the sight of willows and other 
trees whose main branches have been thus broken off, and 
whose trunks are nevertheless covered with young branches 
and shoots, the growth of buds which have been buried in the 
wood and for years dormant beneath their surface. 
We have thus, we hope, placed before the reader a simple 
and accurate method of studying the growth of trees. Of 
the tree it may be truly said that the whole is represented in 
EACH OP ITS PARTS. 
EXPLANATION OF PLATE XVIII. 
Branch of Common Beech ( Fagus sylvatica), showing its annual growths 
for thirteen years. The sets of annuli show the successive points where the 
growth was stopped during winter, and the figures opposite, the year when 
this occurrence took place. 
