40 



Papers from the Department of Marine Biology. 



conversion table was made by Fox. For those who may be confused 

 at first by logarithmic paper the relation of Ph and CO2 tension is 

 shown on ordinary coordinate paper in figure 11. 



2 3 4 56789 10 



CO^ pressure in 0.0001 atmospheres 



Fig. 8. — Conversion table for finding the CO2 ten- 

 sion of sea-water of 24 excess base from the 

 temperature and total CO2. 



54 

 53 

 52 

 51 

 4j 50 



o 47 



u 

 O 46 



45 



44 



43 



1 2 3 456789 10 



CO,, pressure in 0.0001 atmospheres 



Fig. 9. — Conversion table for finding the CO2 ten- 

 sion of sea-water of 25 excess base from the 

 temperature and total CO2. 



23 



24 25 26 



Excess base over strong acid 



Fig 



10. — Data to be used in making a conversion 

 table like fig. 9, but of any other excess base. 

 Transfer values from fig. 9 to the 25 ordinate 

 and draw diagonals through them parallel to 

 the nearest diagonal in fig. 11; the values 

 sought are found where these diagonals cut 

 the ordinate of the excess base sought. 



