144 INJURY, RECOVERY, AND DEATH 



protoplasm, as X 2 , to form a compound. 8 If we suppose 

 that the compound is Na 4 XCa, formed by the revers- 

 ible reaction 



4 NaCl + XZ 2 + CaCl 2 ^ NaiXCa + 2 ZC1 3 



we can calculate the amount of Na 4 XCa which is formed 

 in each mixture of NaCl and CaCl 2 . 



If antagonism really depends on the production of a 

 salt compound, it is evident that some mechanism must 

 exist which insures that an increase in the total concen- 



loo 



Fio. 61. Curve of net electrical resistance of Laminaria agardhii in 85 NaCl + 15 CaCil 

 (unbroken line) ; the trial curve (broken line) calculated from the velocity constants KA = 

 .000364 and KM =.0073. Each observed point represents the average of six or more experi- 

 ments: probable error of the mean less than 10% of the mean. All readings were made at 



15 C. or corrected to this temperature. 



tration of salts can have but little effect as compared with 

 that produced by a change in their relative proportions. 



* It is assumed that XZ a , Na 4 XCa, and ZC1 8 are in solution. Since the 

 per cent, of XZ a which is transformed to Na 4 XCa is negligible, the con- 

 centration of XZ 2 may be regarded as constant. 



