The College Speculum says : "Dr. Beal read a paper on ' Some of the best trees to grow for timber in Michigan.' Our most valuable forest trees found in abundance were black walnut, white pine, white ash, white oak, shagbark hickory, black cherry, tulip tree, rock elm, sugar maple and arbor vitae. Of these white oak, tulip tree, rock elm, arbor vitae and sugar maple grow too slowly to be desirable trees to plant for timber.

"The doctor had been Professor of Horticulture for nine years, but he could not think of any effort of his which gave more satisfaction in proportion to the cost than a couple of acres planted with a large variety of the seeds of trees. The interest in this little arboretum will continue to grow as the trees become larger. Some trees of Catalpa speciosa, nine years old, had been moved when three years old. They are now sixteen to twenty-four inches in circumference a foot from the ground, and about twenty feet high. They have grown in an open place. They are as hardy as any of our oaks. They split down a little like trees of American elm. Some white ashes have grown six years where the seed was planted. Many of these are each eighteen feet high and from eight to nine and a half inches in circumference one foot from the ground. From the start the white ashes have been straight, clean and handsome. Some black walnuts have grown five years where the nuts were planted. Many of them are fifteen feet high and measure seven and a half to eight and a half inches around, one foot above the soil. They are beautiful trees. Of forest trees indigenous to Michigan, all things considered, where the site and soil are suitable, he would select to plant for timber, black walnut and white ash.

He would plant in some Catalpa speciosa to remove for fence posts before the walnuts or ashes were removed".