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ARNOLD ARBORETUM, HARVARD UNIVERSITY. Jamaica Plain, Mass,...........April 3,............... 1890. My dear Muir: I
have yours of the 28th with photograph of Picea engelmarmi in the Bitterroot Reservation. The picture is a lovely one and,
ifit will answer for the purpose, I will have a transparency made from it. Will let you know in a few days what luck I have
in this. I still want the Redwood and Sugar Pine, hut these are difficult fellows to manage, for the bigger the tree the harder
It is to photograph it well. I return Mr. Sawyer's letter and enclose the notice about The Silva from The Evening,Post and
Nation. Like most people who write about the book, this writer devotes more attention to the question of nomenclature than
to the true inwardness of the work.I am horribly busy with new trees which keep cropping up always in the most inaccessible
part of the country, but today I have really learnt two facts; one is that the Birch of the Yukon Basin which we hear so much
about and which appears in all the photographs of the country is not out Canoe Birch, as has generally been supposed, but
the species which we saw at the head of the Lynn Canal; and second that the Alder of the Yukon Basin, or one of them at least,
is the same species which grows on the coast and which used to be confounded with the Al-nus viridis. This we found, as you
remember, a tree at Skaguay and I am going to call it Alnus Sitchensis.These facts I discovered from specimens collected by
some Britisher at Dawson thatsummer and sent 02558