OF THE RETINA TO LIGHT AND COLOUR. 
165 
increased, and therefore the results given in Table V. can only be regarded as 
showing that even in this case parallelisin to the other curves is obtained. The 
curve (IV.) is also shown in fig. 4, 
Fio’. 4. 
O 
Angtolctr aperlg^rA giving curve 4°<1i 
. ' ; .1 - i-. -•-.••I ■ ' ; r . -rr\ - v 0 o' 
tdken witli the 
same initicil 
intensity of light. 
^tnQloypM 
to /S 14 16 18 20 28 84 86 28 SO 32 34 36 38 40 48 44 46 48 -50 58 54 56 58 60 68 64 
Scale of Spectriun (prismatic). 
Table V.—Readings and logs with '012 inch (1' 30") aperture. 
Staudard 
scale 
number. 
-012-mcli (1' 30") 
aperture readings. 
Standai-d 
scale 
number. 
-012-incb (1' .30") 
aperture readings. 
Degrees. 
Logs. 
Degrees. 
Logs. 
tS-hl 
60 
3-50 
34-15 
295 
1-46 
56-3.5 
90 
3-23 
31-93 
280 
1'.59 
5413 
140 
2-80 
29-71 
260 
1-76 
51-91 
190 
2-37 
27-49 
240 
1-94 
49-69 
250 
1-85 
25-27 
210 
2-19 
47-47 
275 
1-64 
23-05 
185 
2-41 
45-25 
298 
1-40 
20-83 
175 
2-.50 
43-03 
310 
1-33 
18-61 
155 
2-68 
40-81 
320 
1-25 
16-39 
135 
2-84 
.38-59 
320 
1-25 
14-17 
127 
2-94 
36-37 
314 
1-30 
