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 



19*93) 

 ~.i.~ f 20'00 

 0-07/ 



Bromine 



co 3 



0-075 



so 4 



2-777 



Calcium 



0-432 



Magnesium 



1-353 



Potassium 



0-399 



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 16 111 " and 

 Vol. ° are marked on the stem. 



xvn 



