. Report upon the forestry investigations of the U. S. Department of agriculture. 1877-1898. Forests and forestry. 102 FORESTRY INVESTIGATIONS U. S. DEPARTMENT OF AGRICULTURE. Section II. Walls of tracheitis of pith ray smooth, without dentate projections. a. One or two large pits to each tracheid on the radial walls of each cell of the pith ray.—Group 3. P. strobus, lambertiana, and other true white pines. b. Three to six small pits on the radial walls of each cell of the pith ray.—Group 4. P. parryana, and other nut pines, including also 7*. balfouriana. II, Ring-porous Woods. [Some of Group
. Report upon the forestry investigations of the U. S. Department of agriculture. 1877-1898. Forests and forestry. 102 FORESTRY INVESTIGATIONS U. S. DEPARTMENT OF AGRICULTURE. Section II. Walls of tracheitis of pith ray smooth, without dentate projections. a. One or two large pits to each tracheid on the radial walls of each cell of the pith ray.—Group 3. P. strobus, lambertiana, and other true white pines. b. Three to six small pits on the radial walls of each cell of the pith ray.—Group 4. P. parryana, and other nut pines, including also 7*. balfouriana. II, Ring-porous Woods. [Some of Group l> and cedar elm imperfectly ring-porous. 1 A. Fores in the summer wood minute, scattered singly or in groups, or in short broken lines, the course of which is never radial. 1. Pith rays minute, scarcely distinct. a. Wood heavy and hard; pores in the summer wood not in (dusters. a*. Color of radial section not yellow ^ish. ]>'. Color of radial section light yellow; by which, together with its hardness and weight, this species is easily recognized Osage orange. b. Wood 1 ight and soft; pores in the summer wood in clusters of 10 to 30 Catalpa. 2. Pith, rays very fine, yet distinct; pores in summer wood usually single or in short lines; color of heartwood reddish brown, of sapwood yellowish white; peculiar odor on fresh section Sassafras. 3. Pith rays fine, but distinct. a. Very heavy and hard; heartwood yellowish brown Blade locust. b. Heavy; medium hard to hard. <t\ Pores in summer wood very minute, usually in small clusters of 3 to 8; heartwood light orange brown Bed mulberry. b'. Pores in summer wood small to minute, usually isolated; heartwood cherry red Coffee tree. 4. Pith rays fine but very conspicuous, even without magnifier; color of heartwood red, of sapwood pale lemon Honey Fib. 7.—Wood of coffee tree. B. Pores of summer wood minute or small, in concentric wavy and sometimes branching lines, appearing as finely feathered hatchings on tangential
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