Quality of light 
a) Sunlight 
Darkness 
b) Sunlight 
Darkness 
c) Diffused light 
Darkness 
d) Diffused light 
Darkness 
1) Sunlight 
Darkness | 
2) Sunlight | 
Darkness | 
3) Diffused light | 
Darkness | 
4) Diffused light | 
Darkness 
1) Sunlight 
Darkness 
2) Sunlight 
Darkness 
3) Diffused light 
Darkness 
4) Diffused light 
Darkness 
Time of 
exposure iodine added 
220 
220 
360 
360 
380 
380 
520 
520 
180 
180 
380 
380 
420 
420 
520 
520 
1115 
Tartaric acid and iodine. 
Amount of 
0.00635 
Unchanged 
Sodium citrate and 
0.00635 
Citric acid and iodine 
0.00635 
| Volume of solution, 
iodine 
| N 
0.00485 | 50) cic: = tartaric acid 
0.00589 | and 5 cc. A iodine 
0.00272 | 
Do 
0.00386 J 
0.00315 
| Do 
0.00377 
0.00242 9 
| Do 
0.00305 | 
iodine 
WU 5 ; 
0.00051 50 c.c. — sodium citrate 
0.00244 \\ and 5 ce. “» iodine 
0.00029 
Do 
0.00141 | 
0.00263 
| Do 
0.00321 
0.00121 | 
| Do 
0.00185 | 
| 
| ; 
0.00512 50 cc. ~ citric acid 
0.00603 and 5 c.c. Sn iodine 
0.00283 
| Do 
0.00375 
0.00318 | } 
| Do 
0.00365 | 
| 
0.00247 
0.00303, 
Do 
