36 BULLETIN 820, U. S. DEPARTMENT OF AGRICULTURE. 
TABLE 19.—Double bark thickness, at diameter breast high, of jack pine in Minnesota. 
Hubbard County, Minn. Cass County, Minn. 
: 
= . 3 ce Iso- 
ae rees in dense s 
Peresst | stad. | Ted or 
high, “iso- Basis. Bark. Basis. 
lated’’ 
Bark Basis we 
Inches Inches. Trees. Inches Trees Inches Trees 
Fe 0. 23 BS tape WN Ree aoe rene | Nee eR ig UR NS eee oa | ice Ee SS 
3 . 30 Diet Meee ee IN Pan (i taigeapinye, ae ok ME 2 [kee te (Aigo 
4 . 38 66 Bae Ae alba eee WSU Vg pees PY 
5 46 i 0. 49 : : . Hos paeeeeae 
6 4 - OL SPE ERS ee 
7 . 63 85 e 72 9 . 52 t 5 
8 510. 57 . 84 13 . 56 4 
9 . 82 47 . 94 7 . 61 8 
10 . 92 43 1.05 5 . 67 16 
1i 1.03 22 EAS 7 73 7 
12 1.14 13 25 4 - 80 10 
13 1. 26 6 1.34 1 87 3 
14 1a Yé 6 1.43 1 . 94 1 
15 1.48 - 1 TGS eet ae eee 1. 62 1 
ie 1.59 2 1.59 2 ie 1 
1 1.70 Ss bres Saree Pore eect 1 9 by ean eee eee 
18 DAS AS Soe eee esl ee eee ee a a eae Re ee 
19 1 iepte faceless cetera es Se ae ee (RS By oi eons ee eee 
20 Gee Sayre ees Pees Reeoee Eeeceseees Lest: Ges Ree ee 
TABLE 20.—Average thickness of bark at different heights above the ground in predominant 
jack pine trees in Hubbard County, Minn. 
[Trees 22 to 102 years old. Measurements by H. H. Chapman, 1905.] 
Diam- Height above ground (feet). 
eter : 
breast | Basis. 
high, 1 | 9 17 25 S58 diet 49 57 
| 
Inches, Trees 
5 0. 60 0.18 0.12 Ont See esl SRR eee eee ee Bl cate 2 
G6 64 23 = UY -12 QL OS eae ae ee so Ee A Peed 8 
7 70 26 .19 -14 10 0: 06.4) 22 563) <5 eee eae 15 
8 76 29 aoNt .16 12+] “S09: S] Aes eS os pee 16 
9 83 32 . 23 =18 15 TO ies aee Ae eens 33 
10 91 35 . 26 avAl 17 14 O209S Awees Soe 37 
11 96 38 . 28 - 23 -18 215 AA Your eS a 21 
12 1.01 41 534) o25) . 20 sav 1 Begin aoe 12 
13 1.05 44 . 34 eae SIPs -18 12 See 9 
1.09 47 33 - 29 - 23 . 20 14 0.11 3 
15 1.12 50 -39 sok - 20 . 22 SEZ 14 1 
16 1.14 52 -41 33 =P) . 24 20 1% 2 
17 1.16 . 54 - 43 35 .29 . 26 23 20 3 
