Dia. change in mm. 
Temperature °F, 
1921] KORSTIAN—DIAMETER GROWTH 457 
On June 7 the dendrograph was moved to the Cottonwood 
Nursery, twenty-five miles southeast of Salt Lake City, Utah, and 
placed on a specimen of Picea Parryana growing in the nursery 
grounds at an elevation of 7400 feet. At this time the spruce buds 
were bursting open and diameter growth was already under way, 
14 TOUT 
12 PTT TT 
wh PETTITT SSRESRBERIBE 
08 DAILY MARCH OF DIAMETER CHANGE 
06 HT IN BOX ELDER TRUNK _ wae 
0.2 n TT TT cr 
r) CO anal TTT 
0.2 Ms, A | | 7 
04 V a TOT 
0.6 e ~ JUERRROGR iy 
[I | Coy aa8) 
74 a | SERRRREER aa8 
72 Ul SRGGRTEE TOT 
70 a ial I TT 
68 Ll Co 
66 1] JSURRER ES! 
. tt 
oe H ) i! NY 
ie L {| 1A | | 
s4Luitth B WI T 
set a TONY T 
50 4 Litt | al Ail 
ssl? Trt eT TUT 
res , LELET TET TTT al agi | 
44 DAILY MARCH OF MEAN TEMPE a8 
“* } ato OF AIR AND CORTICAL LAYER 
38 g x r Temperature 
vi ! ~ Cartinal Layer Temperature 
32 i Ne SaSLEEENA TAREE ESE LTARAEEEGEEED ia 
30 Tl TITHTITILTII tt 
28 L Ty MTL LLL 
26 LUI a TTTHHIITLLL LL LL LLL 
“A 5 10 is: 20. 8 Sows BB ee Be Om SS 
_ 2 Daly march of Seemete ues a in box elder trunk, daily mean tempera- 
; Ogden, Utah, April 1~June 8, 1920. 
as indicated by fig. 3, although it is not probable that much growth 
had taken place before the record began. Growth continued for 
slightly more than five weeks, except for two rest periods of two 
days each (June 19-20 and June 26-27). The shrinkage noted on 
June 9 and 10 may be a rest period, or it may possibly be due 
to a shrinkage occasioned by the drying out of the thin layer of 
cortical tissue after the main portion of the outer bark had been 
removed. In addition to the mean daily temperatures of the air 
and the cortical layer adjacent to the cambium, the mean daily 
