C0 2 -CONCENTRATION AND TEMPERATURE 257 



Representing the partial activities as l a , c a for the 

 lower, and L a , c a for the higher, values of the two factors, 

 and the resultant activities as A; c and A LC , then — 

 A/c A LC 



^a x c a L a x c a 



constant. 



It has also been shown that A cc L and A oc C. 



Hence y- p is a constant. 

 Lb 



II. Two Variables : C0 2 -Concentration and 

 Temperature 



The following gives the results of the experiments on the 

 combined effects of C0 2 -concentration and temperature, 

 light being maintained constant at 1000 lux. 



Activity 



(a) C0 2 -concentration 3-5 mg., temp. 2i°-2; i33-7c.mm.O 



(b) „ 7'° „ » 2i°-2; 186-9 



(c) „ 3-5 „ „ 26°-o; 198-6 

 {d) „ y° » » 26°-o; 283-0 



From (a) and (b) we obtain the partial effect of C0 2 - 

 concentration : 



Activity for C0 2 -concentration 7-0 _ 186-9 _ _ , , 



Activity for C0 2 -concentration 3 • 5 133*7 



From (a) and (c) the partial effect of temperature is 

 obtained : 



Activity at 26 198-6 . N 



-. — — — s — =— =i'4Q • • • • ( 2 ) 



Activity at 21 -2 133-7 



The theoretical result is the product of (1) X (2) X original 

 activity : 



1 -4 X 1-49 X 133-7 =278 -9 c. mm. 



The observed result (d) = 283-0 



It follows that — is a constant. 

 CT 



