516 



Dr. E. J. Mills on Elective Attraction. 



occupied in each operation was an hour and a half. Consider- 

 able heat was produced on adding cold water to the residue, 

 which speedily dissolved. 



1 I. 



II. 



Nitrate taken i,. 



1-2S17 

 1-5287 



120° 



52-80 



1-4702 

 1-7921 

 122=-5 



53-93 

 20-99 



Residue 



Temperat u re 



Constituents of the residue, viz. : — 

 Csesic chloride 



Phosphoric oxide 



19-74 





VaUie of Si 



2-254 



2-166 





The mean value of a is 2*21. 



It may be mentioned that the ordinary method of determining 

 phosphate, and Ptose^s process (vvhich eliminates the influence of 

 a foreign metal), were found to agree exactly. 



Rubidic Nitrate. 



The process of preparation was the same as in the preceding 

 case ; and nitration took place readily. The chloride employed 

 yielded 121"56 instead of 121 "97 per cent, of nitrate^ as de- 

 manded by theory. The fused nitrate split violently asunder on 

 cooling, and assumed a somewhat pearly appearance. It was 

 dried over oil of vitriol and at 180^-190°. 



Action commenced as soon as the oxychloride was added, an 

 odour of chlorine or aqua regia being very perceptible. At 45° 

 there was a copious evolution of a yellow gas ; at 50"^ the liquid 

 became turbid, and at 87° deposited crystals. The average time 

 occupied in the operation was 1'3 hour. Heat was doubtless 

 produced when water was poured on the residue in every case, 

 but it could only be perceived in III. Solution took place 

 readily. 





I. 



11. 



III. 



Nitrate taken 



1-4315 



1-4901 



125° 



11-52 

 5-18 



1-0767 

 1-1413 

 127°-5 



15-61 



7-82 



2-1349 

 2-4716 

 126° -3 



29-13 

 15-70 



Residue 



Temperature 



Composition of the residue, Tiz. : — 

 Rubidic chloride ... 



Pliosphoric oxide 





Values of a 



2-61 



2-34 



2-18 





The mean value of « is 2*38. 



