162 



On the Expansion of Sea-water by Heat. 



[Jan. 6. 









Propor- 









Propor- 



Tem- 

 pera- 



Specific 



Propor- 

 tional parts 



tional parts 

 for -00001 



Tem- 

 pera- 



Specific 

 gravity. 



Propor- 

 tional parts 



tional parts 

 for -00001 



ture. 



gravity. 



for 1° C. 



increase in 



ture. 



for 1° C. 



increase in 



o 







spec. grav. 









spec. grav. 





•0000 



•0000 



o 





•0000 



•0000 







1-02000 



3 



1 



19 



1-01740 



25 



0-944 



1 



1-01997 



4 



0-995 



20 



1-01715 



25 



0-943 



2 



1-01993 



5 



0-990 



21 



1-01690 



26 



0-941 



3 



1-01988 



6 



0-986 



22 



1-01664 



27 



0-940 



4 



1-01982 



8 



0-932 



23 



1-01637 



28 



0-938 



5 



1-01974 



9 



0-879 



24 



1-01609 



29 



0-937 



6 



1-01965 



11 



0-975 



25 



1-01580 



29 



0-935 



7 



1-01954 



12 



0-972 



26 



1-01551 



30 



0-934 



8 



1-01942 



13 



0-969 



27 



1-01521 



30 



0-932 



9 



1-01929 



14 



0-966 



28 



1-01491 



31 



0-930 



10 



1-01915 



15 



0-963 



29 



1-01460 



32 



0-928 



11 



1-01900 



17 



0-961 



30 



1-01428 



32 



0-925 



12 



1-01883 



17 



0-958 



31 



1-01396 



32 



0-922 



13 



1-01866 



19 



0-956 



32 



1-01364 



33 



0-919 



14 



1-01847 



20 



0-954 



33 



1-01331 



33 



0-915 



15 



1-01827 



21 



0-952 



34 



1-01298 



33 



0-912 



16 



1-01806 



21 



0-950 



35 



1-01265 



34 



0-908 



17 



1-01785 



22 



0-948 



36 



1-01231 



34 



0-903 



18 



1-01763 



23 



0-946 











opposite 18 in Column III. is *00023, which multiplied by *5 equals 

 •00011; and 



1-01763 -'00011= 1-01752. 



Subtract this from the observed specific gravity, 



l-02475-l-01752=-00723. 



Divide by -945 (the number corresponding to 18-5), and the quotient is 

 •00765, which added to 1-02000 gives 1-02765 as the specific gravity at 0°O. 

 Example II. Specific gravity observed at 15° O. =1-02570. 



l-02570-l-01827='00743, 

 and 



■00743 

 •952 



= •00780. 



Therefore specific gravity at 0° C. =1-02780. 



We next discuss the discrepancies which occur between our own 

 results and those of Professor Hubbard ; and we point out various cir- 

 cumstances in the methods employed in m aking and reducing the latter 

 observations which appear to us to explain in a great measure the 

 divergences which exist. 



