207 
in cross section, usually in groups, often not very distinct; wood with a 
rather characteristic odor when wet; western n species. 
Douglas Spruce. (Pseudotsuga Douglasii.) 
b. Some uie rings more than } in. broad, often ета l in width....48. 
46 a. Western wood; average growth rings about in. ig or less broad. 
Bull Pine. (Pinus ponderosa.) 
b. Eastern and southern woods; average growth rings more than ņ% in. broad. 
47. 
47 a. Wood noticeably reddish; transition from spring to summer wood often 
n in is ее ѕоте 8 the um ..Red те (Pinus resinosa.) 
b. 1 : i о summer wood abrupt. 
Skoret Pine. (Pinus echinata.) 
48 a. Bands of summer wood distinctly marked from bands of spring wood on 
each side; et qom often variable in width; some resin ducts often 
L 
only on one side of ring; resin ducts appear as circular dots in cross s ion; 
wood comparatively hard and hea . Tamarack. (Larix laricina.) 
49 a. Wood ene ralibus — Hight, with a aa resinous, shingle-like odor 
when ; wood darker than the spring wood. 
- White Cedars. (Thuja. Chamaecyparis.) 
Gy УОС BOE rompletelvanin d. о О ыркы es oa T. 
50 а. Resin ducts present appeari s specks especially when wood is wet. 
b. Resin ducts wanting, or is аран Ble ul EV LS 
un 
51 a. Growth rings usually variable in width; wood when fresh with a soapy or 
greasy character; summer wood straw colored. 
Cypress. (Taxodium distichum.) 
bo Woods not completely as in 8.5.0245 ss cese e es oo eese. 52. 
52 a. Wood comparatively hard and heavy; some growth rings usually i in. or 
more Broad. а a R Tamarack. (Larix laricina.) 
Ө Wood comparatively soft and пене ое EIE ccs 53- 
53 a. Wood with a decidedly reddish tinge on longitudinal section when dry, not 
ПЕНУ red ia muumer WOO... e c DUR СОА ERE LS as 54. 
b. Wood not noticeably red on longitudinal ѕесііоп...................... 55. 
54 a. Eastern wood; transition from spring to summer wood often abrupt in some 
wth rings; sap wood often with bluish streaks. 
Pine. (Pinus resinosa.) 
b. Western wood; transition from spring to summer wood gradual in all of the 
Prawth fip. s ores Western White Pine. (Pinus monticola.) 
55 a. oue kids m ue often жт Ten = =o eos eee 
than the spring wood; NUM wood..Sugar Pine. (Pinus Lambertiana.) 
b. Woods not Paget! dig [iow нт OT d не еа неее eee 56. 
56 a. Growth = about т; in. or more broad; resin ducts conspicuous when wood 
t; wood with pine odor when wet; eastern wood. 
White Pine. (Pinus Strobus.) 
