502 
THE  ADMIEALTT  ASTEOXOMICAL  EXPEEEMEXT 
h m o 
At  22  27  . . . +0-9 
At  22  29  . . . +0-5 
At  22  31  . . . +0-9 
Mean  of  three  groups,  including 
twenty-one  readings 
My  naked  hand,  held  at  a distance  of  3 feet,  produced  about  + 7’0, 
and  at  a distance  of  about  3 inches,  produced  about  . . +20’0. 
Again,  on  August  16th,  or  the  day  after  full  moon,  and  with  that  luminary  at  a 
height  of  49°,  the  comparison  of  similar  groups  to  those  of  the  previous  night  gave, — 
j+O-77 
Moon’s  heat. 
h 
m 
0 
At  22 
43 
. . . +0-2 
At  22 
45 
. . . +0-3 
At  22 
54 
. . . -fO-2 
At  22 
56 
. . . +0-6 
At  22 
58 
. . . -i-0-5 
At  23 
0 
. . . +1-9 
At  23 
2 
...  0-0 
At  23 
14 
. . . -0-1 
At  23 
16 
. . . -fO-2 
At  23 
18 
. . . -fO-8 
At  23 
20 
. . . +0-2 
Mean  of  eleven  groups  . 
+ 0-44 
The  hand  held  at  a distance  of  18  inches  in  front  of  the  cone,  produced  at  2 3*^  27“  a 
heat  effect  of  -l-9°'0. 
The  “hand”  observation  of  each  night  was  rude,  and  merely  to  be  sure  of  the  sign 
accompanying  heat ; but  the  candle  observations  were  made  as  carefully  and  acciu’ately 
as  possible ; and  as  Peice’s  candles  appear  to  be  very  uniform  in  quality,  it  is  possible 
that  the  value  of  the  degrees  of  the  thermo-multiplier  may  be  accimitely  obtained  in- 
terms  of  Faheenheit  by  further  observations  in  this  country.  AVe  shall  then  be  able  to 
state  the  moon’s  radiation  in  similar  terms  to  the  sun’s.  That  the  moon’s  radiation  was 
fully  sensible,  the  above  observations  will  I think  abundantly  show' ; the  only  doubt  is 
the  respective  weights  to  be  given  to  the  different  series.  The  observations  of  the  16th 
having  been  affected  by  wind,  and  the  first  series  on  the  15th  ha\ing  been  one-sided.  I 
am  inclined  to  weight  them  as  follows : — 
15*=:2,  15^=4,  and  16=^1. 
The  simple  arithmetical  mean  is,  for  the 
Moon  at  45°  high  .....  Kadiation  =+0°-42 
When  corrected  for  the  weights  it  becomes  . =-l-0°‘37 
