Publication 
47 
able to hedge round the natural monu- 
ment. Thus, if a rare tree in the 
forest is to be protected, it may be 
marked by little stones put round it. 
Figure 4 shows a Service Tree {Pyrus 
torminalis) marked in such a manner 
by the proprietress of an estate in 
West Prussia. The beauty of the 
forest is not impaired by these white 
stones : the woodcutter s attention is 
drawn to the tree ; and consequently 
he does not cut it down. 
Publication 
It is true that in several cases a 
natural monument, the habitat of a 
rare plant or the dwelling-place of a 
notable bird, for instance, is best 
preserved by its not being published. 
It happened not long ago that after 
the publication of a map showing the 
whereabouts of the nests of certain 
