( 630 ) | ‘a 
D. Experiments with d- Fructose. 
Two specimens of this substance were in my possession. A small 
quantity of crystallised d-fructose from Mrrck of Darmstadt and a 
larger quantity which Mr. ALBERDA VAN EKENSTEIN, director of the 
Government sugar laboratory of Amsterdam, had been kind enough 
to prepare and recrystallize for me. I will not neglect to express 
here my particular thanks for the great kindness with which 
Mr. ALBERDA has obliged me with this expensive preparation as this 
alone has rendered it possible for me to do the experiments with 
d-fructose on a somewhat larger scale. 
Both preparations gave the same figures as will be noticed from 
the tables. 
PAB L EAT, 
N./,o ethyl acetate + N./,o NaOH + N./, d-fructose. 
First series Second series 
(ALBERDA’s preparation.) (MERCK’s preparation.) 
t Cn kC, t Cn kC, 
30 6.73 -— 30 6.60 — 
45 5.82 0.0104 45 5.80 0.0092 
60 5.21 097 k=0,59 60 5.10 98 k=0,59 
80 4.52 098 80 4.40 100 
ul 3.73 099 110 3.63 102 
145 3.07 104 145 3.03 102 
average 0.0100 average 0.00988 
BP) At ie AK. 
N./,9 ethyl acetate + N./,, NaOH + N./,9 d-fructose. 
First series. Second series. 
t Cn kC, t Cn kC, 
Lt 7.48 -— 10 7 53 
20 6.38 0.0191 20 6.38 0.0180 
30 5.49 190 k=1,038 33 5.44 193 k=1,01 
45 4.51 193 45 4.50 192 
60 3.85 192 60 3.82 194 
80 3.22 191 80 3.15 198 
100 2.76 192 
average 0.0192 average 0.0191 
