144 INJUEY, EECOVERY, AND DEATH 



protoplasm, as Xg, to form a compound.® If we suppose 

 that tlie compound is Na4XCa, formed by the revers- 

 ible reaction 



4 NaCl + XZs + CaClj ;=^ NaJCCa + 2 ZCl, 



we can calculate the amount of Na4XCa which is formed 

 in each mixture of NaCl and CaCla- 



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- 



75 HOURS 



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

 (unbroken line) ; the trial curve (broken line) calculated from the velocity constantB 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„ NatXCa, and ZCl, are in solution. Since the 

 per cent, of XZo which is transformed to Na.XCa is negligible, the con- 

 centration of XZj may be regarded as constant. 



