68 BOTANICAL GAZETTE [JULY 
TABLE UI 
Pinus palustris, 230 ANNUAL RINGS, CROSS-SECTION I FOOT FROM GROUND 
TRACHEID LENGTHS—MILLIMETERS TRACHEID LENGTHS—MILLIMETERS 
ANNUAL RING ANNUAL RING 
Max. Min Av. Max. Min. Av. 
BO eens a. 1.80 2.42 T9000; cues 5.90 3.90 4.99 
MOL. Fa aas 3.85 2.40 3.06 Pa Rae EM ee 6.25 S078 4.92 
BOs eects 4.50 2.80 3.70 ESO 6 es fete) 4.00 4.87 
Po tie as 4.95 2.80 4.06 PO0e 652 1s 6.20 4.00 5.08 
ROG orice wes 5.30 2.95 4.11 TICs ea 05 3.45 4.57 
OSes 6.05 3.05 4-33 LEO! as Bo7s 3.40 4.10 
POs con is: 5225 2.85 3 LOO eels 5.50 3.10 4.03 
BOs 5.970 2705 4-4 ROG Bag Se 6.20 Z ay 4.42 
Site 6.05 2.20 4.66 BIOe ers 20.08 8.35 4.66 
FOO Se | 6.30 3345 4.88 oO a sian sigs 5-90 3.10 4.35 
Ls is We pas 6.05 3.60 4.57 230. are: 5.20 2.85 4.00 
E20 ees 5.80 3.85 4.66 
TABLE IV 
Tsuga canadensis, 80 ANNUAL RINGS, CROSS-SECTION I FOOT FROM GROUND 
TRACHEID LENGTHS—MILLIMETERS TRACHEID LENGTHS—MILLIMETERS 
ANNUAL RING 5 ANNUAL RING 
Max. Min. Av. | | Max. Min. Av. 
1 EL 2.320 0.95 1.63 SO ie. A25 1.85 5.29 
7 2 ae seeape aap te 3.20 1.15 2.20 (ia eae ar 3.80 1.60 2.48 
a0: 3,75 2.05 2.99 FOS ee. 2.20 1.40 2:47 
45 As 2.26 3.16 80a wee: 3.25 1.80 2.84 
EFFECT OF POSITION IN THE VERTICAL AXIS ON THE 
LENGTH OF TRACHEIDS 
TABLE V 
Picea rubens, 50 ANNUAL RINGS, AVERAGE TRACHEID LENGTH IN MILLIMETERS 
Distance from ground in feet 
Annual ring 
I 6 12 18 24 30 
TOs P08 i te ee a re ee ea ere een eres 
200 b oy ei 295 2.49 ee PE estes Ps AM ed a oreea cry ok, 
co er 2.58 2.92 2.84 2.40) | 68.80 a ae ee 
ADE eee eG, 3.37 3.00 3.48 3.32 Se. 26 2.75 
[eG 3.48 3.56. 3.84 3.70 3.5% 
