822 Prof. R. W. Atkinson. 



Table XIII.— Action of Koji Extract on Starch at 10—15° C. 



10 grms. starch, to 10 grms. hoji. 



Time. 



Dry starch, 

 in 500 

 cub. centims. 



Weight of 

 koji used, 

 as extract. 



. 



Total starch 

 products. 



Specific 

 rotatory 

 power. 





Grms. 



Grms. 



Grrms. 







10 



10 



9 705 



193° 





55 





9 925 



112 



72 „ 



') 





9-925 



102 -7 



The results of these experiments are shown graphically in Curves- 

 C and D. In the last series, Table XIII, at the end of 72 hours the 

 reduction in the specific rotatory power is not much greater than in 

 the previous experiments after 48 hours, although to all appearance 

 the conditions were identical. But it is probable that different por- 

 tions even of the same lot of hoji differ somewhat in activity. Another 

 possible cause of difference is suggested by Curve C. The inclination 

 of that curve between 21^ hours and 26 hours is much greater than 



Curves C and D. 



Action of koji extract on starch at 10° — 15° C. 



GO 



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1 





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100° 





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2 



24 





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a . so 7 



2 hours 



Time in hours. 



the average inclination after the first rapid fall is over. This was un- 

 doubtedly due to the temperature between these two observations 

 having been higher than the average taken over the whole time. 

 During the greater part of the time the temperature was not higher 

 than 10° C, except in the middle of the day, when it stood about 

 15° C. The two observations at 2H hours and 26 hours were made 



