SAP DENSITY AND FREEZING POINTS OF LEAVES. 129 
Degrees Centigrade 
77. Hydrangea quercifolia (3)................+- 0.9325 
78. Aesculus austrina (shade) ...............+. 0.918 
79. Magnolia glauca (2) ...........seeeeeevees 0.8972 
80. Magnolia acuminata (3) ........--..+---:: 0.8736 
81. Magnolia Umbrella (2) .............--+0+- 0.87 
S24) Diervilla (TOBCA Vata (2) ese ck. ces fee oes 
83. Cercis canadensis (3)..........cceceneeeces 
SS MOriss ale 4) geste cakes ols secon song henge es 
85. Magnolia Yulan (3)..........---eeeeeeeees 0.7792 
86. Magnolia Lennei X (2)........--.---+ee eee: 0.741 
87. Fraxinus americanus (4)................6-- 0.712 
88°)" Asimina  trilob® (5) (5.0. 6). c. 6c ts on aye wise se 0.625 
89. Vitis vinifera (5)..-............-02-50500. 
90. Ilex opaca (5)... .cee eee e ee cece ee eee eees 0.596 
By dividing the above list, in which the species are 
arranged in descending order, according to the respective 
freezing point lowerings, into halves, and by listing under 
each half the number of species therein belonging to the 
sections outlined in the early part of this paper, the follow- 
ing arrangement results :— 
First Hatr. Seconp HAtr. 
6 of Section I. 3 of Section I. 
13 of Section II. 13 of Section IT. 
6 of Section III. 6 of Section III. 
13 of Section IV. 7 of Section IV. 
0 of Section V. 10 of Section V. 
In the above the absence of any of Section V from the 
first half is very noticeable, and only a small fraction of a 
degree keeps the three of Section I in the second half. 
Those belonging to Section III, as might be expected, are 
evenly distributed in both halves, since they represent the 
intermediate position between Sections I and V. However, 
the large number of Section II in the second half, and 
the large number of Section IV in the first half seems to 
be rather inconsistent, although when we take into con- 
sideration the fact that these sections represent purely 
arbitrary divisions, it is not to be given much thought. 
