Open Letters
Arrangement of Herbarium.
I take out and put back the sheets of my grasses many times in the course
of a month. My own collection of genera is arranged alphabetically ; that of
the college herbarium according to Bentham and Hooker's Genera Plantarum.
The alphabetical list is much the handiest to use. I shall soon arrange the
species of grasses in each genus alphabetically. I shall be glad to hear the
views of others on this subject, especially of those who have tried both ways.
Agricultural College, Mich.

W. J. BEAL.