16 
observed in nurseries in the lake region, the Douglas Spruce requires 
about ten years in which to form a leader, during which time it will 
have grown about 2 feet high; thereafter 1t resembles the Norway 
Spruce in its development. Red Cedar grows well from the first, 
though never a rapid grower as compared with White Pine at its best. 
Among the pines that seem especially adapted to the plains the Rock 
(Bull) Pine is a very slow grower during the first five years and seems 
never to make as rapid height growth as the Scotch Pine. Scotch and 
Austrian Pine are similar in growth, the Scotch being a little :more 
rapid; both are better growers than either Rock or White Pine during 
infancy, but the White Pine under favorable conditions surpasses them 
at its most rapid period of growth. The White Pine grows slowly in 
its wild state for the first seven years, then with increasing rapidity to 
about the thirtieth year, then more slowly, but still at a good rata, to 
about the eightieth year, by which time the principal height growth 
will have been attained. The Bur Oak is likewise slow up to about the 
tenth year, and it never grows as rapidly in height as does the White 
Pine at its best, but it is a persistent grower over a long period. The 
Green Ash is a tree of comparatively slow growth, but it mai: tains 
about the same rate from the first until it has made its principal | sight 
growth. The White Elm is more rapid than Ash or Oak during its 
first years, and it also continues a vigorous height growth until it 
approaches maturity. The Cottonwood is a very rapid grower from 
the first until maturity, as short-lived trees are apt to be. The Box- 
elder grows with great rapidity until 5 or 6 years of age, and makes 
its principal height growth by the thirtieth year. It is a medium to 
small tree when mature. The Catalpa and Black Locust are among 
the most rapid growing trees during the first few years from seed, but 
after the tenth year they grow much more slowly, being surpassed 
thereafter by White Elm. Black Cherry is a rapid and continuous 
grower, almost equal to the White Elm. Russian Mulberry grows very 
rapidly the first few years, making many branches and being thus an 
exceptionally good soil cover. Its period of rapid height growth is 
about the same as the Boxelder, and like that species it is a medium- 
sized tree. Silver Maple is a rapid and continuous grower for the first 
twenty-five years, when it usually begins to fail in eclese plantation. 
Black Walnut is somewhat more rapid in growth than Green Ash dur- 
ing the first few years from the seed. At ten to fifteen years Black 
Walnut will usually equal Boxelder in height, and in favorable soils it 
has attained a height of sixty feet in twenty-five years, though such 
rapid growth is exceptional. Honey Locust is a more moderate grower 
than Black Locust, but fully equals the White Elm and is of similar 
habit. 
These notes, made from observations in Nebraska, lowa, and South 
Dakota, may not apply with even approximate truth in the Southwest, 
where the conditions are very different, but they will serve to call 
