I'abi,® I .—Description and condition of trees used in transpiration 
Apr. 14,1923 Physiological Requirements of Rocky Mountain Trees 109 
Bristlecone pine. 
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® At end of tests, all root tips are old and lignified. 
0 Root tips very short, showing slow or late development. 
as '*** Pi« computed as semicircles; limber pine and bristlecone pine as filth circles, more or less; Douglas fir as elipses; Engelmann spruce 
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Initial green weight (gm.). . 
Green-dry factor of sample tree. 
Initial dry weight (computed). 
Final weight: 
Green. 
Dry. 
Weight gain for season: 
Green.. 
Dry. 
Ash: 
Weight (gm.). 
Percentage of final green weight. 
Computed leaf surface: 
Volume of top by displacement (cc.)... 
Length of needles (cm.). 
Cross section (mm.)c. 
Ratio of area (in sq. mm.) to voltune (in cu. mm.). 
Computed area (sq. cm.). 
Leaf exposures (sq. cm.), from photographs. 
Net dry-soil weight (gm.). 
20 per cent water (gm.). 
Tare (gm.). 
Gross, with tree as above. 
