able I.— The Apparent Compressibility of Water in Glass, as observed in Piezometer C. No. 1, on board H.M.S. 

 "Challenger," in the South Pacific, in October, November, and December, 1875. The observations are arranged in 

 order of apparent compressibility, which is expressed in volumes per million per atmosphere. Above each entry of 

 the apparent compressibility is, on the left, the depth, in metres, of the water at the particular station, and, on the 

 right, its temperature, in Celsius's degrees. 









Apparent compressibility pel 



million per atmosphere. 









Apparent 4 

 compressibility. 



5 4 



6 47 4 



8 4 



9 5 



5I1 5 



2 5 



3 5 



4 





45 -0 



1800 2°* 6 

 46-8 



1890 2° - 8 

 47-1 



4140 i°-6 

 48-7 



1620 2°'4 

 49-6 



1800 2° - 4 



50-6 



2700 i - °9 

 51 -0 





1800 3°'i 

 53 -4 



2880 i°-8 

 55 "5 







2385 z°-2 

 46-8 



3195 l0 '9 

 47 -3 



333° l0 '6 

 48-1 



1620 2°'7 

 49-5 







t8oo 2°'4 

 50 -8 



2700 2 0, 3 



51 -7 















4005 2°'0 



47-8 



4050 i°- 4 

 48 -0 



49 -8 8 



1800 2°'3 

 50 -1 

















2610 2° - 



47 -0 



2700 2° - 



48 -9 



1620 3°'o 

 48-8 



252O 2°"2 



49-4 



3645 i°"3 

 49-7 





















27OO 2°'0 



48 "4 



49-65 





















2700 2° - 



48 -15 



4085 i '4 

 49-2 























2700 i°-8 

 49-75 























3285 i°-8 

 49-1 























5I9 49 95 























1800 2°'7 

 49-8 























324O 2°' 2 



49 -7 























1800 2°-8 

 49-0 













Mean values . . | 



45 -0 



2090 2 '4 

 46 -8 



2925 2°-i8 

 47-3 



3035 l0 '95 

 48 -56 



2700 4 



2540 2°-i7 

 49-48 



9-16 



1800 2°'4 

 50 -5 



2700 2°- I 



51 35 





1800 

 53-4 



2880 i"-8 

 55-5 



Number of ob-J 

 serrations 1 



1 



2 



4 



7 J 13 

 20 



3 



2 







1 



1 



