lo 
derived by calculation. In one experiment the mean of 
four trials for the greater limit gave 2 83 cm. ; and the mean 
of four trials for the smaller limit gave 2*65. Hence the 
result will be as follows : — Standard solution contains 10 
cub. c. of caramel in 500 cub. c. of water, length of column 
21 ’2 cm. 
ABC 
80 2-74 77-4 
The above result was obtained by using the right eye 
alone. I made another series of determinations, using the 
left eye alone. For the greater limit the mean of four trials 
was 2 '85, and for the smaller limit the mean of four trials 
gave 2-58. Hence the result will be as follows — Standard 
solution same as last. 
ABC 
80 2-71 78-2 
I next made some experiments with stronger solutions. 
For the greater limit the mean of four trials gave 278, and 
the mean of four trials for the smaller limit 2*68. Hence the 
results were as follows : — Standard solution 40 cub. c. of 
caramel solution in 500 cub. c. of water ; length of column 
21*2 — observations made with right eye only 
ABC 
320 2-73 310-6 
I also compared a solution containing 820 cub. c. with 
another solution containing 10 cub. c, the theoretical length 
was 0-65 cm., a column between 0’6 and 0“7 would satisfy, 
but the meniscus rendered the exact determination difficult. 
I also made a further experiment with the solution con- 
taining 40 cub. c. ; one determination for the greater limit 
gave 57, and one determination for the smaller gave 5. 
Hence the results are as follows : — Standard solution 10 cub. 
