MAUK. — SALINITY OF SEA-WATER IN THE BERMUDAS. 



675 



proportional error was thusonein two thousantl. This measurement 

 limited the relial)ility of the whole analysis, which was thus trust- 

 worthy to five hundredths of one percent. 



Corrections for change of temperature are unnecessar}' when the 

 standardization and analyses are carried out under conditions suffi- 

 ciently similar. As the limit of accuracy of reading the burette was 

 one in two thousand, this allowed a variation in temperature of 8° C, 

 which was a greater change than ever took place. 



That no other sources of incidental error existed was shown by the 

 facts that duplicate analyses always agreed to one part in two thou- 

 sand or better, and that comparisons between the silver nitrate solu- 

 tion and the standard water always showed the same ratio to exist. 



Table of Results. 



The positions were usually determined by sighting conspicuous 

 objects on shore. 



The "depth below surface" antl tiie "depth of bottom" were 

 measured directly on the iron cable which carried the bottle. For the 

 positions marked with an asterisk the depth of the bottom was not de- 

 termined, but is that marked on the chart of the " Bermuda Islands" — 

 issued by the Hydrographic Office, Washington, D. C, and corrected 



