110 BOTANICAL GAZETTE. | Ma 
Key to Forest Trees.—It was thought advisable to introduce for twelve : 
weeks, daily, the study of botany into the Sophomore year of the mechan- . 
ical course at Michigan Agricultural College. This is all the time the . 
student is expected to give to botany, and even this is to be of practical 
value in the study of woody plants. The first five weeks were occupied : 
in learning how to distinguish the trees of Michigan; mainly bya study 
of leaves, twigs, buds, outer bark, sections of wood, all aided by a simple 
microscope. No attention was paid to the flowers. To aid the memory 
the following artificial classification was devised, and it worked well: 
A. Leaves alternate and two-ranked. 
Bassw 
The Elms: American, Red and Rock. 
The Maples: Sugar, Red and Silver. 
2. Pinnately compound. 
The Ashes: White, Black and Blue. 
«. img: on to agian nked. 
Pe hian ety 
Button wood. 
Cherr 
Sassafras. 
Birches: Yellow, Canoe and Cherry. 
we Cottonwood, Aspen, Large-toothed Aspen. 
Oaks : Noite Red, Black, Yellow, ete. 
Chestn 
Bee ee 
Tronwood 
2. Compound. 
1. Pinnate. 
Black Walnut. 
Butternut. 
Hickory: eer Pignut, Bitternut. 
2. More than on ce pin 
Honey : airy 
entucky Coffee Tree. 
D. Conifers, é 
1. Deciduous, 
Larch. 
me Evergreen, 
Pines : White, Red, Scrub. 
Arbor Vite 
Spruces : “Hemlock, Black, White, Balsam. 
edar: Red, Jun niper. 
