Note 57 — PART IV. NOTICES OF AUTHORS RELATIVE TO TIMBER. (continued 2)

The fineness of vessel or fibre of the Siberian crab, may be induced by the arid warm air, the continued radiation of heat and light upon the portion above ground, and the coldness of the ground around the roots during the short summer in Siberia, where the air and surface of the ground is warm, and vegetation progressive, while the ground remains frozen at a small depth. Like all varieties of plants habituated to colder climate, the Siberian crab developes its leaves under less heat than varieties of the same kind which have been habituated to milder climate.