Professor Popenoe prefers, "as a rule, to move evergreens, as indeed we do all trees, in the spring, just before the buds open and the shoots push. At this period the conditions are most favorable, because the tree is exposed for the shortest possible time to injury by loss of moisture from the leaves, as it is now pushing new roots, and the spring rains may be expected at this time to assist its revival. Success has usually followed our trials of winter planting where proper precautions have been taken to preserve a large ball of frozen earth about the roots, and to avoid the bruising of the branches of the tree, an injury from which they do not easily recover. Protection to the branches is best afforded by drawing them carefully toward the tree, and wrapping and cording to place the whole lower part exposed to danger in handling, in burlaps, old carpets or similar material. So guarded, the tree may be loaded by tackle upon a sled or stone-boat, and moved with the minimum of danger. In this method of planting, it is of course essential that, on resetting, the crevices about the frozen ball of earth be compactly filled, lest on thawing, the earth fall away from the roots and expose them to dry air".

The species which have done the best upon the college grounds, and which are recommended, are these: red cedar, Austrian pine, Scotch pine, Table-mountain pine (Pinus pungens), dwarf mountain pine (P. montana), pitch pine (P. rigida), southern yellow pine (P. mitis), white pine, Norway spruce, white spruce, Colorado blue spruce (Piceapungens), Siberian arbor-vitae, bald cypress (Taxodium distichum), gingko, European larch.