592 Philippine Journal of Science 1920 
TABLE 4.—Glucose oxidation by potassium permanganate at various tem- 
peratures rising from 29° to 95° C. in two minutes. 
{For final volume of mixture of 100 cubic centimeters.] 
: . 1N ee : 
Observation. corueena fe seg peoccine oy 
ganate. 
°C =|Min. sec. ce. Per cent. 
Boars eae co en et Sia ee 60 0 55 8. 55 64,77 
Beebe cease sce oa oan, Peete re a ook cS 70 1 15 8.55 64.77 
3. Be Ser ere ae es 80 1 30 9.68 73. 33 
Wcmiceewcesctccactece PieecLuLuos beeen y ciesiwadaubccaens 90 1 50 10.18 77.12 
Bac oes ussecsa ae le pee urbe sas Se eweewcnscocs 95 2 00 10. 93 82.80 
Os gacc. ae (i eg CO RSE Se ee ee 230 11.50 87. 12 
Ni ae ee aa ae eck de ee a 60 11.80 89.39 
Re ia ieee sand otek oe Pe a 90 12.04 91.21 
ie ar ee 2120 12.08 91.51 
a eh ia Te es coe ee 2180 12.53) 94. 92 
* Length of time after 95° C, had been reached. 
Table 2 shows the volumes of 0.1 N potassium permanganate 
used to oxidize 10 milligrams of dextrose at different intervals 
of temperature for a total volume of 60 cubic centimeters and 
with heating power so regulated that it raises the temperature 
of the mixture from 29° to 95° C. in exactly four minutes. In 
all determinations ten or eleven quadruplicate observations were 
made. Column four shows the actual number of cubic centime- 
ters of potassium permanganate used for oxidation, and column 
five gives these same values in percentage of the volume of 0.1 
N potassium permanganate solution required for the complete 
oxidation to carbon dioxide and water of 10 milligrams of 
glucose. For each determination blanks were run, and the val- 
ues in column four are actual values minus the corrections for 
the average blanks, 
Tables 3 and 4 are similar to Table 2, but the heating power 
here is that required to raise the temperature of the mixture, 
60 cubic centimeters and 100 cubic centimeters, respectively, 
from 29° to 95° C. in exactly two minutes. 
Tables 2 and 3 were prepared by oxidizing the glucose with 
25 cubic centimeters of 0.1 N potassium permanganate solution 
diluted to a final volume of 60 cubic centimeters, while Table 4 
was obtained by using 50 cubic centimeters of 0.1 N potassium 
permanganate diluted to a final volume of 100 cubic centimeters. 
The procedure followed was that described under C, with cor- 
responding modifications, 
The data in these tables are visualized in fig. 6 in which the 
