NOTES ON EUCALYPTUS. 519 
ences in the barks as described; the barks of EH. vitrea 
vary, within limits, according to age of tree and locality. 
M. Naudin, Mr. Baker and I have indicated the affinities 
to E. coriacea and HE, amygdalina, In the present state 
of our knowledge, the latter species (in the connection 
referred to) should be given as E. radiata Sieb. 
It is possible that the differences between the types of 
the two forms may be explained on the assumption of a 
leaning towards one or other of the parents. In most of 
the localities in which H, vitrea has been found, both EH. 
coriacea and EK. radiata occur, but as regards localities in 
which one or other of the reputed parents do not occur, it 
is not unreasonable to suppose that seeds have been con- 
veyed (by stages, if necessary) by one or other of the 
usual methods, and that these seeds have germinated and 
produced seed-bearing trees, which have continued the 
processes indicated indefinitely. 
