132 MR J. Y. BUCHANA.N ON THE 



Table XV. : — CsBrO^. — Here an irregular feature is observed in that there is a 

 negative value of 0"023 at w=l/32, which changes to a positive value of 0'039 at 

 7n= 1/64, then a diminution in a positive value at m= 1/128 to the maximum negative 

 value of the series of 0*049 at m= 1/256, with a slight diminution at w= 1/512. 



In sub-table c a similar series of values for (iA — v is seen, except that they are 

 more regular. 



Table XVI. : — KIO^. — In sub-table a the high positive value of 0-154 for dA-v 

 at m= 1/8 is changed to a negative value of 0'039 at m= 1/16, and with a diminution 

 of the negative value to 0"003 at 1/32 the maximum negative value of 0"072 is reached 

 at m= 1/64 ; then a transition occurs at m = 1/128 to a positive value of 0"046. After- 

 wards the positive value falls away. 



There is thus a change from a high positive value to a high negative value, and 

 then reversion to moderately high positive value. 



The same feature is observed in sub-table c, but it is of a more undulatory character. 



Table XVII. :—RbIO^.— The positive value of 0-024 at m= 1/32 gives place to the 

 maximum negative value of 0-046 at m= 1/64 ; then there is a diminution in negative 

 values leading to a positive value of 0-046 at 1/512 in sub-table a. 



The same character is observed in sub-table c, only more regular, the maximum 

 negative value of 0-032 occurring at w= 1/128. 



Table XVIII. : — Cv/Og. — ^The values for dA — v in each of the three sub-tables 

 constitute the most regular of all the series. All the values are negative and reach a 

 maximum value at m= 1/128 in all three sub-tables, and fall away regularly for higher 

 and lower values of m. 



The character of the values for CsIOg somewhat resembles those for RblOg. 



Section IX. — Notes on the Values of v for the Bnneads MR and MROg. 



§ 56. The increment of displacement produced in 1000 grams of water at 19-5° C, 

 when 1/2 gram-molecule of potassium chloride is dissolved in it, is 14*001 Gj; when a 

 molecularly equivalent amount of potassium bromide is dissolved in the same quantity 

 of water, the increase in the displacement is 17'547Gx; when the salt in solution is 

 potassium iodide, the number is 22 '7 7 8 G^. Replacing, therefore, the chlorine by 

 bromine increases the displacement by 3-546 Gx ; and if the bromine be now replaced by 

 iodine, there is a further increase of 5-231 G-r in the displacement; or, replacing the 

 chlorine by iodine causes an increment of displacement of 8-777 G^. Proceeding in a 

 similar manner with the other salts of the ennead MR and tabulating the results, we 

 obtain Table I. An inspection of the table shows us that the differences for Br — CI when 

 equivalent quantities of the salts of K, Rb, and Cs are dissolved in the same quantity 

 of water are of the same order of magnitude till m = 1/32. The same characteristic is 

 observed between the same limits of m when bromine is replaced by iodine, but the 

 differences for the same gram-molecular weight of the salt are in these three series 

 greater than those observed when chlorine is replaced by bromine. In the third section 



