SPECIFIC GRAVITY AND DISPLACEMENT OF SOME SALINE SOLUTIONS. 51 



in series (h), (c), or (d), but it will be noticed that the values agree very well inter 

 se, the maximum difference, or amplitude, between any two values being only 19 in 

 the sixth decimal place. For series b, c, and d the amplitudes are 25, 32, and 46 

 respectively ; or if we take the difference between the highest and the lowest value 

 of the specific gravity in any of the three series, the amplitude is only 49 in the sixth 

 deciinal place. 



Attention should be called to the number of figures after the decimal place given 

 in columns t, dwt, W, and Wh^o, which is greater than is consistent with the prob- 

 ability of experimental error, but they are inserted in order to facilitate the better 

 understanding of the various steps in the process of correcting for temperature, and to 

 avoid any ambiguity which might arise were the temperatures only given to two 

 places of decimals, and the corresponding weights to only four decimal places. The 

 effect of inclusion or exclusion of the last two decimal places in W and Wg^o has 

 no appreciable effect upon the value of the sixth decimal figure in the specific gravity. 



Twenty-seven salts— KCl, EbCl, CsCl, NaCl ; KBr, EbBr, CsBr ; KI, Rbl, Csl ; 

 KClOg, RbClOg, CsClOg; KBrOg, RbBrOg, CsBrOg ; KIO3, RblOg, CsIOg ; KNO3, 

 RbNOg, CsNOg, LiNOg, NaNOg, Sr(N03)2, Ba(N03)2, and Pb(N0g)2— have been dealt 

 with in solutions varying in concentration from 1/2 to 1/1024 gram-molecule per 1000 

 grams of water, and at temperatures of 15", 19'5°, 23°, and 26° C. 



§ 21. Statistics relating to the Range of Variation of Temperature during a 

 Series of Observations. — In the following table statistics of the variations of the 

 temperature of the liquid, while a total of 1316 series of observations was made 

 with hydrometers Nos. 17 and 21 — namely, 837 with No. 17, and 479 with No. 21 — 

 are given. In 68 per cent, of the series made with No. 17 there was no sensible 



A. 



B. 



C. 



A. 



B. 



C. 



Number of Series of 





The Nurabeis 



Number of Series of 





Tlie Numbers 



Observations made 



During which the 



under A expressed 



Observations made 



During which the 



under A expressed 



with Hydrometer No. 



Range of 



Variation of 



Temperature was 



as Percentages. 



with Hydrometer No. 



Range of 



Variation of 



Temperature was 



as Percentages. 



17 



21 



17 



21 



17 



21 



17 



21 







°C. 











°C. 







568 



265 



000 



68-0 



552 



2 











14 



0-2 



00 



48 



51 



0-01 



5-7 



10-6 



3 









15 



0-4 



0-2 



68 



54 



0-02 



8-1 



11-3 



1 









16 



0-12 



0-2 



19 



23 



003 



2-3 



5-0 



1 









17 



0'12 



0-2 



12 



16 



0-04 



1-4 



3-3 













18 



0-00 



0-2 



34 



18 



0-05 



4-0 



3-8 













19 



0-00 



0-2 



7 



8 



0-06 



0-8 



1-7 



6 



2 







20 



0-71 



0-4 



1 



3 



0-07 



012 



0-6 



1 











21 



0-12 



0-0 



13 



10 



0-08 



1-6 



2-1 



1 











24 



0-12 



0-0 



4 



1 



0-09 



0-5 



0-2 







1 







28 



0-00 



0-2 



44 



18 



0-10 



5-2 



3-8 



1 







0-30 



0-12 



0-0 



1 



1 





 3 



0-11 

 0-12 



0-12 

 012 



00 

 0-6 





















1 



1 



013 



0-12 



0-2 



Total, 837 



479 





100-00 



100-00 



