SCIENTIFIC SUMMARY. 
421 
been previously obtained. This curve was found to agree more nearly with 
Professor Zollner’s law for the Moon’s light, on the assumption that her 
surface acts as if it was grooved meridionally, the sides of the grooves being 
inclined at the uniform angle of 52° to the surface, than with Lambert’s 
law for a perfectly smooth spherical surface. 
“ The laws of absorption in the atmosphere, and of variation of heat and 
light, are indicated in the following abbreviated tables : — 
Zenith 
Distance 
Light of Stars trans- 
mitted by Atmosphere 
Moon’s Heat trans- 
mitted by Atmosphere 
o 
0 
1-000 
1-000 
30 
0*984 
0-988 
40 
0962 
0-958 
50 
0-902 
0-907 
60 
0*800 
0-836 
70 
0-642 
0-698 
80 
0*407 
0.465 
85 
0-208 
— 
— Before entering the atmosphere the Moon’s heat = 1*262, so that 
at the zenith fully |th is absorbed before it reaches the Earth’s surface. 
Distance 
from 
Full 
Moon 
Lambert’s 
Formula 
Phase- curve 
for Heat 
(Obseived) 
Phase-curve for 
Heat transmitted 
by Glass 
Curve representing 
Zbllner’s Photo- 
metric Observations 
Zbllner’s For- 
mula for 
Moon’s Light 
100 
96 
44 
_ 
90 
128 
62 
— 
— 
— 
80 
165 
89 
— 
— 

70 
205 
117 
11*4 
88 

60 
246 
149 
16*7 
109 

50 
286 
186 
22*0 
132 
154 
40 
324 
228 
27-3 
166 
212 
30 
355 
276 
33-5 
212 
278 
20 
381 
335 
46 3 
271 
346 
10 
398 
394 
64-3 
342 
417 
0 
404 
403 
69 5 
390 
488 
10 
398 
367 
56-7 
327 
417 
20 
381 
323 
44-5 
269 
346 
30 
355 
278 
33-5 
218 
277 
40 
324 
234 
24-4 
167 
213 
50 
286 
191 
18-1 
122 
157 
60 
246 
155 
14-5 
84 
109 
70 
205 
127 
11-8 
58 
71 
80 
165 
103 
9-2 
49 
— 
90 
128 
78 
6-5 


100 
96 
54 
3-8 
— 
— 
I. 
II. 
III. 
IV. 
V. 
VI. 
^‘N.B. — To compare the heat transmitted by glass with Zollner’s photo- 
metric observations (Column Y.), the quantities in Column IV. must be 
multiplied by 5*792. 
