510 



Dr. E. J. Mills on Elective Attraction. 



Between 100° and 110° the latter distilled over almost entirely. 

 If the temperature were raised much beyond this point, it was 

 noticed that,at some part of the intervalll8°-125°,a little orange- 

 coloured gas would be eliminated. The bare occurrence of this 

 secondary reaction could not always be avoided. A short time 

 after the last drop of the distillate had volatilized under the con- 

 tinued influence of the heated air-current, the bath was removed 

 and the apparatus was cooled, washed externally, dried, detached, 

 closed up, and weighed. The average duration of the operation 

 was If hour. The " residue " had a pale orange colour. When 

 cold water was added to it, a varying amount of heat was 

 evolved, it being observed that this evolution was greatest when 

 the consumption of nitrate had been greatest, and when conse- 

 quently the effect of the action of water on the phosphoric pent- 

 oxide was least masked by conversion into work of solution. 

 The addition of water, moreover, immediately changed the 

 orange tint of the residue into a white ; and the aqueous wash- 

 ings always reddened litmus powerfully*. 



The analytical treatment of the residues presented no features 

 of special interest f. 





I. 



II. 



III. 



IV. 



V. 



VI. 



VII. 



r 



Argentic nitrate 

 employed 



Residue obtained .. 



Temperature 



Composition of the 

 Argentic nitratej 

 Argentic chloride 

 Phosphoric oxide 



1 2-8568 



2-8093 



125° 

 residue, V 

 64 02 

 31-78 



4-30 



2-1746 



2-1800 

 121° 



iz.: — 

 40-77 

 49-77 



9-4; 



1-0519 



10589 

 122° 



25-96 

 61-91 

 12-93 



2-7^idd 



2-7345 

 120^ 



57-87 



36-44 



6-60 



2-0152 



20182 

 115^ 



54-78 



38-03 



8 23 



1-8878 



1-8631 

 115° 



53-57 



40-31 



702 



2-4959 



2-4529 

 118° 



47-13 



4609 



8-49 



10010 



10001 



100-80 



100-91 



10104 



100-90 



101-71 



Hence the values "l i 

 of a are respec- U 7 32 

 tiveiy J 1 



5-21 



474 



547 



4-58 



5-69 



5-38 



The mean of these numbers is 5*48; probable error 0'21. 



* This latter remark holds true for all the nitrates alluded to sub- 

 sequently. 



t The composition of the residue is expressed in percentages throughout 

 this paper, except in the ease of lithie nitrate. This has been done partly 

 for the sake of uniformity, partly for showing sensible aberrations in cer- 

 tain reactions ; it need not be remarked that the experimental error in ana- 

 lyses of this kind falls considerably within the common departure of the 

 totals from 100. 



X Calculated from the original nitrate on the basis of the chloride found. 



