1906] WIEGAND—BUDS ‘AND TWIGS IN WINTER 429 
evidence upon this point I performed the following experiment. 
The two thermometers used in the previous experiments were 
selected, and the bulb of one was coated with black cloth; that of 
the other was wrapped in a layer of cotton about twice the thickness 
of the wool in the horsechestnut bud, and was then coated with 
black cloth. The surface of both bulbs was therefore black. 
TABLE IV. 
Bulb covered with black cloth, and bulb covered with cotton and black cloth; trans- 
erred from a temperature of 56° C. to a room of 9° C. 
Cloth bulb Cotton bulb Time ° Difference Time difference 
134-8. 134° F. o sec. o° F. (0° C.) © sec. 
130 131 5 I (0.5) 7 
128 131 to r Seda SS 10 
125 128 15 3 (1.: 15 
123 128 20 5 (2:7) 15 
222 127 25 5 (2: 15 
119 125 30 6 3.3) 20 
i17 123 35 6 2-3) 20 
114 T21 45 7 3-9) 20 
ach a T19 50 8 4-4 25 
109 117 55 8 4-4 26 
106 Hie 9 (5.0) 30 
104 112 70 8 4.4 30 
100 110 80 Io oy) 37 
98 107 85 9 -0 40 
96 105 9 9 iO 40 
93 103 105 Io 5 40 
QI IOI 113 Io us 42 
99 120 to fe 45 
87 97 130 10 5 45 
86 96 135 Io as 43 
oy 93 145 9 (5-0) 59 
82 ot 155 9 (5.0 55 
80 89 165 9 (5.0) 55 
78 88 173 10 8 _ 62 
77 i 86 178 9 0 7? 
76 85 185 9 -O 75 
74 84 195 be) “5 75 
73 83 205 Io 5 80 
72 82 210 10 “5 85 
71 81 215 10 5 95 
7° 79 225 9 te) 95 
69 78 235 9 .O 100 
68 77 250 9 re) 105 
67 76 60 9 .0 110 
66 74 270 ee) 110 
65 73 285 8 (4.4) 120 
64 72 295 8 4-4 130 
63 71 310 8 4-4 135 
63 70 320 7 (3-9 135 
62 69 335 7. (9 140 
