130 TSUGA, OR HEMLOCK SPRUCE FIRS 
who plant it to-day, and recall yet another Whittier 
description : 
How yonder Ethiopian hemlock, 
Crowned with his glistening circlet, stands, 
What jewels light his swarthy hands. 
For the purposes of identification one way we 
might suggest would be to divide the remaining six 
into two groups, and seek help from the diversity 
of shape in the leaf margins. 
In the case of the T. Canadensis, T. Albertiana, 
T. Brunoniana, the leaves are serrulate. 
In the case of the T. Sieboldii, T. Diversifolia, 
T. Caroliniana, the leaves are entire. 
We must make this reservation with regard to this 
method of identifying—namely, that these dis- 
tinctions, as between serrulate and entire, by reason 
of the almost invisible obscurity of these leaf marginal 
signs, do not extend to the groping student, even with 
the aid of magnifying glasses, that generous help that 
might have been expected from the promising 
announcement. 
Loudon describes the T. CANADENSIS as slightly 
denticulate, so it is not to be wondered that more 
amateur and unequipped observers have difficulty 
in finding the signs with the naked eye. Under a 
good glass you can perceive clearly some little perch- 
back-looking protuberances, situate at rather long 
intervals apart, and this proclaims their serrulation. 
Of all Hemlocks perhaps the T. Canadensis and the 
T. ALBERTIANA show the nearest resemblance, and. 
‘since they are the same tree of the same country, 
only with a different geographical habitat, there is 
no particular reason why they should not. Perhaps 
their greatest difference exists in their shape and 
growth. As the Deodar differs from the Cedar of 
