412 Dr. A. Compton. The Influence of the Hydrogen 



Table III. 



Temperatures at 

 the beginning 

 and end of 



Maltose hydrolysed per cent, for the followin 

 of the medium. 



y H + concentrations 





















each experiment. 



in- 3.0 



in-3-2 



i n— 3*4 



in— '-7 



i n— 5.6 



T A— 6-2 



1 n— 6-s 



J-U 



1 n— 7*2 



J-U * . 



17 -6-17 -7° 



— 



— 



— 



— 



21 -1 









— 



3 "2 



17-7-17 -8 



11-4 



10 -o 

















18 -0 



— 



— 



15 - 5 



— 



— 











— 



— 



23 -0 



— 



— 





— 



— 



26 -8 







7 -2 



— 



24-5-24-6 



— 



— 



24 -0 



— 



— 



— 



— 





— 



24 -8-25 -0 



— 



— 



— 



28 '2 



29 '7 



— 









8-6 



25 -0-25 -1 



— 



21 -1 



— 



— 



— 



. — ■ 



16 -9 



— 



— 



25 -2-25 -4 



21 -1 



— 



— 



— 



— 



— 



— 



— 



— 



27 -8-27 -9 



— 



— 



— 



— 



— 



35 -9 



— 



12 -8 



— 



32 -0-31 -6 



— 



— 



— 



40 -6 



— 



— 



— : 



— 



— 



32 -2-32 -1 



28 -2 



















32 -8 



■ — 



35 -9 



39 -1 



— 



52 -5 



— 



32 -8 



— 



12 -8 



34 -5-34 -6 



— 



— 



— 



— 



— 



57 -1 



— 



21 -1 



— 



37 -8-38 -2 



28 -2 







— 



— 



— 



— 



— ■ 



— 



— 



40 -0 



19 -7 



39 -1 



50 9 



— 



71 -7 



— 



52 5 



— 



15 -5 



41 -8 



— 



— 



— 



— 



— 



78 -5 



— 



28 -2 



— 



42 -3-42 -2 



11 -4 



















42 -4-42 -5 





28 -2 

















42 -5-42 -6 









Do O 













45 -4 











76 -8 









21 -1 



46 -8-47 -0 





8-6 



18 -3 















47 -0-45 -6 















66 -8 







4/ U 









46 -4 





85 -5 





32 -8 





49 -7-49 -6 













83 -8 





• 28 -2 





49 -8-49 -6 















66 -8 







49 -9-49 -8 







7-2 





43 -5 









12 -8 



50 -3 









16 -9 













52 -0 











31 -2 



66 -8 



49-4 



21 -1 





52 -.1-51 -9 



















10 



53 9-53 -8 















39 1 







54 -0 











16 -9 



49 -4 





15-5 



5 -9 



On plotting the percentage of maltose hydrolysed against the mean 

 temperature of the experiment, these numbers give a series of optimum 

 temperature curves from which the optimum temperature corresponding to 

 each particular H + concentration of the medium may be read. The curves 

 are summarised for purposes of description in two figures (figs. 2 and 3). In 

 fig. 2 are collected the curves corresponding to H + concentrations greater 

 than the optimum reaction of fig. 1 ; while in fig. 3 are collected the curves 

 corresponding to H + concentrations equal to, and less than, the optimum 

 ■of fig. 1. 



Consider fig. 2. Here we have a series of curves of varying altitudes, 

 which is what one would expect from the results already recorded in fig. 1 ; 

 as the H+ concentration of the medium is increased beyond the optimum 

 value the enzyme is gradually rendered less efficient. And, in this respect, 

 fig. 2 indicates, further, that the diminution in the activity is true for 



