46  Mr.  hunter  on  the  Heat,  &c. 
exp.  xix.  December  2d,  the  atmofphere  at  540,  the 
tree  at  540. 
I11  all  thefe  experiments,  which  were  made  at  very 
different  times  in  the  day,  viz.  in  the  morning,  at  noon, 
and  in  the  evening,  the  tree  was  in  fome  degree  warmer 
than  the  atmofphere,  excepting  in  one,  when  their  tem- 
peratures were  equal.  For  the  fake  of  brevity  I have 
drawn  up  my  other  experiments  (which  were  made  on 
different  trees)  into  four  tables,  as  they  were  made  at 
four  different  degrees  of  heat  of  the  atmofphere,  inclu- 
ding thofe  made  in  the  time  of  the  very  hard  froft  in  the 
winter  of  17  7 |.  They  were  as  follows. 
Atmofphere. 
Names. 
1 ft. 
Height. 
Diameter. 
Heat. 
Carol,  poplar, 
Ft.  In. 
- 2 
Ft.  In. 
2 
0 
' 29t 
Engl,  poplar, 
4 
29i 
Orien.  plane, 
3 
30 
Occid.  plane, 
3-6 
2 
3° 
Carol,  plane, 
1 
if 
3° 
Birch, 
3-6 
2 9t 
29  deg.  i 
; Scotch  fir, 
3.6 
4 
Cedar  libanon, 
2.2 
4t 
Arbutus, 
2.6 
3t 
30 
Arbor  vitae, 
2.8 
3t 
29 
Diffid.  Cyprus, 
3 
3° 
Lacker  varnifh, 
3-6 
2 
3° 
1 
Walnut  tree, 
5 
2.4 
3i 
The 
