ADDENDA 



CHART I. An isotherm of 90 F. has been omitted over 

 the North- Western part of Australia. 



PAGE 29. 



DISSOLVED SUBSTANCES IN 1,000 PARTS BY WEIGHT OF 

 SEA WATER OF " CHLORINE " CONTENT 20 PRO MILLE 

 (CALCULATED FROM THE MEAN OF SEVENTY-SEVEN 

 ANALYSES BY DITTMAR). 



Chlorine .. .. I9'93) 20 . oo 



Bromine .. .. o-oyj 



C0 3 .. .. .. .. 0-075 



S0 4 .. .. .. .. 2-777 



Calcium .. .. .. 0-432 



Magnesium .. .. .. i'353 



Potassium . . . . . . o- 399 



Sodium .. .. .. 11*055 



36-091 



According to Knudsen's tables, such a sea water would 

 have a salinity of 36-13 pro mille. The slight difference 

 between them is due chiefly to improvements in analytical 

 methods. 



PAGE 47. 



Messrs. Negretti and Zambra have recently made to- 

 Mr. Matthews' instructions two reversing thermometers 

 with their original form of constriction ; apart from the 

 gradations, which are somewhat coarse, these appear on a 

 laboratory test to be thoroughly satisfactory. An auxiliary 

 thermometer is provided, and the glass " Jenaer i6 m " and 

 Vol. are marked on the stem. 



xvn 



