90 
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MONOGRAPHS OF AMERICAN TIMBER TREES. 
The wall spaces between cases 81 and 86 are in process of in- 
stallation with groups representing the various more commercial 
timbers of North America. These monographic groups are being 
finished as rapidly as proper curing of the specimens will permit. 
The scheme is to represent each species by the following grouped 
specimens : 
1. A branch from the tree, in leaf, with the flowers and 
fruits, and an authentic piece of wood from the individual furn- 
ishing the branch 2. photograph of the tree in summer, show- 
ing its general form and character of growth. 3. A photograph 
of the identical tree in winter, showing its method of branching 
and general winter aspect. 4. A trunk section showing the bark 
and form characters, these trunks to be uniformly one-half the 
average size attained by the species. 5. A cross section of the 
same trunk, showing the character of the annual growth. 6. A 
detail map of North America, upon which the range of the 
species is depicted in three grades of color, showing the prin- 
cipal, general, and limital extension of the timber. 7. A descrip- 
tive label, giving the characters and utilization of the species. 
8. A large plank, plain sawed, showing the objective commercial 
character of the lumber. • 9. Various fancy boards showing the 
cabinet forms of the species. 
ILLINOIS WOODS. 
Beyond this, and continuing to the end of the gallery, is 
arranged in natural order, a very complete series of the timber 
trees of Illinois. 
THE HERBARIUM. 
The herbarium of this department is located in the north 
balcony over the main entrance to the Museum,, and is open at all 
times, during business hours, to students of systematic phytology 
and ecology. The collections are large and particularly rich in 
the flora of North America, the West Indies and Mexico, and 
the genera Salix, Euphorbia, Juncus and Carex, with a generous 
amount of species of Europe, Asia, and Africa. 
