162 



MR J. Y. BUCHANAN ON THE 



NaCl = 58-5. T=19-5°C. 



7I>. 



Weight of Solution 

 (mMR+1000). 



Maximum, Mean, and 



Minimum Specific 



Gravity. 



Displacement 



corresponding to each 



Value of S|iecific 



Gravity. 



1 

 Difiference of Displace- 

 ment for successive 

 Maximum, Mean, and 

 Minimum Values of 

 Displacement. 



m. 

 1/128 



W grams. 

 1000-457 



S. 

 1 1-000344 

 - 1-000325 

 1 1-000320 



A. 

 1000123 

 -132 

 -137 



dA. 



2/128 



1000-914 



( 1-000662 

 • 1-000652 

 I 1-000646 



1000-252 

 -262 

 •268 



0-129 

 -130 

 -131 



3/128 



1001-371 



1 1-001022 



1-001007 



1 1-001000 



1000-349 

 •364 

 -371 



0-097 

 •102 

 •103 



4/128 



1001-828 



( 1-001305 

 <' 1-001295 

 ( 1-001286 



1000-522 

 -532 



•542 



0-173 

 •168 

 •171 



5/128 



1002282 



j 1-001621 

 \ 1-001615 

 1 1-001610 



1000-660 

 •667 

 •671 



0-138 

 -134 

 -128 



6/128 



1002-742 



( 1-001953 

 <^ 1-001947 

 ( 1-001936 



1000^788 

 •793 

 -804 



0-128 

 •127 

 •133 



7/128 



1003-199 



1 1-002306 

 J 1-002294 

 ( 1-002282 



1000-891 

 -903 

 -915 



0^103 

 •110 

 •111 



8/128 



1003-656 



( 1-002645 

 <^ 1-002636 

 (1-002623 



1001-007 

 -017 

 •029 



0^116 

 -114 

 -114 



The confirmation of the reality of the nature of the changes in displacement with 

 change of concentration which is given by the preceding table is due to the close 

 agreement of the specific gravity values in any series for a particular value of m, and 

 the character of change in the dijEference of displacement is the same whether the 

 maximum or minimum values for diff"erence of displacement A for consecutive values 

 of m, or maximum value of A„^ with minimum value of ^m+i> are taken. 



§ 75. Although the above table shows that no further confirmation was required, 

 the repetitions intimated in § 72 were made, and gave the following results. 



The concentrations selected for this purpose were 2/128, 3/128, and 7/128 gram- 

 molecules. 



The solutions were made by the direct dissolution of the requisite amount of salt in 

 the appropriate quantity of water, and the results obtained in these later experiments 

 are compared in the following table, side by side with those obtained in the first series 

 of experiments : — 



