The American Arbor Vitae and some other evergreen trees were more or less injured, and many killed, as it was generally supposed, by the severe winter of 1855. While the hard winter had much to do in their injury and destruction, it was, in fact, the great drought of the two preceding summers that laid the foundation of the evil. The greatest damage done to these trees appeared to be in the driest situations. In such locations, the soil was so dry that the young fibres of the roots must have been so completely dried up or weakened that they were not sufficient to sustain the trees through the severe winter. I lost five Hemlock trees, that had been planted seven or eight years, and had attained the height of ten to twelve feet, which were in a vigorous growing state previous to the drought. A number of Arbor Vitaes, about the same height, were also very much injured, or so much checked in their growth that it is doubtful whether they will fully recover. The destruction of Arbor Vitae trees was very great throughout New England, especially in dry land. In some instances, where they were planted for hedges, a majority of the trees were killed.

If our native evergreen trees, which we consider so hardy, were thus damaged and destroyed, it is no wonder that some of the newly-imported choice evergreens should have disappointed our hop 58 and expectations in relation to their hardiness.

I have been trying very hard to acclimate the Deodar Cedar (Cedrus deodar), Chilian Pine (Araucaria imbricata), the Cypress of Europe (Cupressus sempervirens), the Cedar of Lebanon (Lavix cedrus), and some others, with partial success. I hoping to succeed, not only with these beautiful evergreens, but with others which I have now under treatment; but still have my fears that our New England climate will be too severe for them

The Norway Spruce (Abies excelsa), and Austrian Pine (Pinus Austrica), are great acquisitions for our climate, being perfectly hardy; and with these and our native Pines, Cedars, Hemlocks, etc., we must content ourselves until it can be ascertained, for a certainty, what others may be depended upon. The Silver Fir {Picea pectina) is a beautiful tree, much handsomer than our native species, rather tender when young, but proves hardy when well established. The young trees are imported from Europe, and grown in our nurseries. They are not, however, very plenty yet, as they are more subject to perish on their passage than the Norway Spruce and some other young evergreens.

The Chinese Arbor Vitas. - Thuya Orientalis. - This is a handsome evergreen tree, and has proved hardy, having stood unprotected for the last three winters. The foliage is very beautiful, and of a more lively green than the American species. The only objection to it is, that, during cold weather, the foliage assumes a brownish hue.

Thuya aurea has singular foliage, of a bright yellowish-green color. T.filiformis has weeping, pendant branches. T. varie-gata has variegated foliage. All three varieties are novelties, and, having been planted in my garden last spring, I shall have an opportunity of witnessing the effects of the present winter (185G) upon them. As the great body of snow on the ground has given them a good protection, I hope to see them come out bright.

Taxus baccata and T. Hibernia, the English and Irish yews, with the Thuyas, and some other evergreens, are in the process of acclimation, and I hope I shall be enabled hereafter to report them hardy.