During the winter of 1902-3, and again during the winter of 1903-4, the writer was one of a party sent by the United States Bureau of Forestry to take stem analysis and valuation surveys on the holdings of the Kirby Lumber Company preparatory to making a working plan for the use of the company in the future treatment of its timber lands. The holdings of this company lie in Hardin, Orange, Newton, Jasper, Angelina, Sabine and San Augustine counties, and include the largest continuous area of virgin Longleaf pine existing in the United States at the present time. Incidentally to the work in hand, occasion was taken to make a few observations on the ecology of the region, and these observations will be presented in the present article