REPRODUCTION OF ROCK PINE. 15 
seed never developed properly. The tree bore eleven cones which 
would mature the following fall. Not a seedling was found on the 
area covered by the cones. 
Tree No. 2.—Diameter breasthigh, 11 inches; height, 25 feet. 
The conditions for the establishment of seedlings beneath it were 
poor, but somewhat better than in the case of tree No. 1.- Upon 
an area of 20 by 22 feet were found 173 cones, containing 66 seeds, 
all of which had been injured by insects or had failed to develop. 
There was no recent reproduction. The only seedling pine on the 
area was 6 feet high. 
Tree No. 3 —Diameter breasthigh, 30 inches; height, 65 feet. The 
tree was solitary, and was one of the oldest and largest trees in the 
neighborhood. The condition of the ground beneath it was more 
favorable to seedling growth than in the case of any other tree 
examined. An abundance of: needles were distributed over the 
ground, and some low deciduous shrubs (Symphoricarpus occiden- 
talis and Rhus tribolata) furnished shade favorable for germina- 
tion. The ground was literally covered with cones of different ages. 
Upon an area of 40 by 45 feet were found 165 recent cones, containing 
685 seeds, of which only 15, or less than 2 per cent, were sound. 
Eight seedling pines, from 6 inches to 2 feet high, were growing on 
this area. The tree bore no cones set the previous year, but an abun- 
dance set the year of the examination which would mature the follow- 
Ing season. 
Trees No. 4 and No. 5—No. 4, diameter breasthigh, 18 inches; 
height, 50 feet. No. 5, diameter breasthigh, 19 inches; height, 55 
feet. These two trees stood about 50 feet apart, on a northwest slope, 
and dropped their cones over a contiguous area measuring 50 by 70 
feet. Judging from the number of fallen cones, they are prolific 
bearers. The ground is covered with dense grama-grass sod. From 
240 cones examined, 546 seeds were obtained, of which only 5 were 
sound. A great many had been destroyed by worms. Tree No. 5 
haa a great many cones of the second year before still on it. A num- 
ber of these were picked and examined, but no good seeds were found 
in them. The tree bore no cones of the previous year, but a great 
many which would mature the following year. There were no seed- 
lings beneath these two trees. 
Green cones were picked from three other trees and the seeds 
examined. The results were as follows: 
Tree No. 6—Diameter breasthigh, 13.5 inches; height, 25 feet. 
The tree was in vigorous condition, and had made a height growth of 
10 inches during the season. The cones were large and apparently 
healthy. Twenty, taken from various parts of the tree, were found 
to contain 1,307 seeds, of which 191, or 14.6 per cent, were sound. 
The majority of the imperfect seeds seemed to have failed of fertiliza- 
