The wood is very porous, but the large pores are confined to the springwood, while the broad bands of summerwood are dense.
The springwood is filled with large pores, the summerwood with smaller ones.
There are many pores, however, and those in the springwood are arranged in bands.
The genesis of Raspberry Plain, just north of springwood, has already been given.
The large pores are in the springwood, and those of the summerwood are smaller, but numerous.
It builds up the annual ring, first the springwood very rapidly, and then the summerwood more slowly.
The wide rings of annual growth, and the distinct layers of springwood and summerwood, give the basis for good figure.
A given bulk of it contains more actual wood substance and less air and water than the springwood.
The inside of the ring—that portion nearest the heart of the tree—is the springwood, the rest of the ring is the summerwood.
The annual rings are variable in width, and the proportionate amounts of springwood and summerwood also vary.