ir, 



THE WHITE PINE. 



Froiii the table it ai«poais tliat tlie sjiecitic woifrlit of the tiiiil)er is ijuite iiulepe'ideut of the 

 rate of {riowth.aml that tlie indiviilual vmiation {reiierally moves \vithiii voiy narrow limits. The 

 diagrams (figs. 16 aud 17) show the relation of weight for the different sections from the stump 



so 



^ 

 ^ 

 X 



40 



.30 



^ 

 d- 



10 I'd :U) 411 50 1)11 70 >o yo 



Position . of discs, feet from (jroimd . 



Fio. 16 — Dia<;rani f^liotriog specific weight of wood nt tlifiereut croB.^ sections of the stem : aUo a clecrcnso of weight front the stunjp 

 upwanl. and the similarity of the wood of different trevs. (Five trees, over 200 years *»ld. Dotted line indicates tlie average.) 



ui)ward; the slightly greater weight of the older timber, as comiiared to sajiling material, the 

 uniform decrease in weight from stump u))ward, aud al.sothe uiiiforniity of the several individuals 

 of any group of trees is clearly apparent from the lines. "The same decrease in weiglit from below 





40 



S: 



Z35 



10 211 :l(l 40 ,50 nil To ■•O 'JO 



Puxition of ili.scj). fi'ct from grouml . 



Fio. 17 Diagram allowing specific weiglit of tilndry wood at different points in the stem from ground upward: a. six trees, 200 to 2S0 



years old: I. five trees, 125 to 160 years old; c. seven trees, 100 to l25Te,nr8 old: rf. ten trees. 75 to luO year.i old; f. ten trees, 50 to 74 years 

 old : /. eighteen trees. 40 to 49 rears old : p. nineteen trees. 30 to 3ft years old. 



upward is observed in tlie wood of any given period of growth: thus, the wood of the last forty 

 rings (next to the bark i was fouud to be as follows : 



J'n-reatein iveiglit of I he wood of the liml i oiitvr y furtii ringg in the sererni dMf from ntump lyiiron. 



Specific gravity. 



IHf-k niiiiilier. 



^'!Si?'°' Tree Xo. 1. Tree Xo. 2. 1 Tree No. 8. 



