1898 ] THE SIZE OF EVERGREEN NEEDLES 433 
which the measured needles grew), and the thickness of the 
annual vzngs. The needles are measured in millimeters. 
I. Pinus Austriaca Hors. 
1895. 104.0, 106.4, 106.2, 104.2, 101.0 (II pairs). 
a 25.0, 27:7, 29.1,° 29.6, 29.4, 28.5, 29.0, 29.1, 28.5, 28.3, 27.1, 25.2, 
24.0, 23.9, 23-3, 23.1, 22.7, 22.2 (12 pairs). 
1897. 107.1, 113.9, 112.8, 114.0, 114.0, 105.6 (12 pairs). 
Needle-length Cross-section Stem Rings 
1895. 104.36™™ 0.864™™ 54 PJ aed 35 tracheides. 
1896. 26.51 0.523 7.8 . 
1897. II1.23 1.188 8.2 75 e 
Though the response of the plant to its injury was more 
marked in this tree during 1896 than in any of the other trees 
tepresented by tables, its recovery by the next year was unusu- 
ally complete, only the stem’s growth in length seeming still to 
Suffer. 
II. Pinus Strobus L. 
There were too few needles for their sequence to be instruc- 
tive. Inthe growth of 1897 they were borne uniformly in fives ; 
in that of 1896, often in threes or fours. Those of 1895 were 
all fallen, 
Needle-length Cross section Stem Ring 
1896. 66.59" g.239% 0.189™™ 
1897. 83.39 0.296 0.307 
I. Picea alba Link. (P. Canadensis (Mill.) B.S. PL). Seven« 
year old tree. 
2 1895. 9.0, 11.7, 13.9, 14.0, 14.8, 15.4, 15.5, 15-5, 15-4, 15.5, 15.1, 15.0, 14.4, 
a 13.3, 12.3 (6 needles). 
~ 1896. 4.3, 5.1, 5.7, 6.2, 6.6, 7-1, 74s 7-8) 8:0, 8.0, 8.1, 8.4, 8.3, 8.3, 8.3, 8.2, 
a 8.2, 8.0, 7.9, 7.75 7-5) 7o4y 71) 6.8, 6.3, 5-7 (12 needles). 
10.7, 13.5, 16.6, 17.6, 18.4, 19.5, 19-7, 20.2, 20.2, 20.4, 20.4, 20.3, 19.8, 
19.6, 19.5, 19.1, 18.2, 17.8, 16.8, 14.9, 14-4, 12.6, 7.8. 
Needle-length Cross section Stem Ring 
1895. 14.05™™ 0.418™™ sq ‘Le we 0.430™™ 
1896, 7.25 0.262 6.7 0.185 
1897. 17.30 0.600 14.0 0.298 
