TUNGSTEN COMPOUNDS. 81 



The following six analyses were made from six different 

 preparations : — 



Analyses I. and II. Substance distilled three times in 

 chlorine over charcoal. 



Analysis III. A large quantity of chloride was boiled 

 in a retort whose neck dipped under mercury until no 

 more red oxychloride could be seen to come over. Still 

 this residue contained a trace of lower chlorides, as it 

 rapidly decomposed on addition of cold water. 



Analysis IV. No. III. was twice redistilled in chlorine 

 and again treated in a retort as before. The substance 

 still contained traces of lower chloride, as it was decom- 

 posed by cold water. 



Analysis V. Prepared by burning pure metal in dry 

 chlorine and redistilling. 



Analysis VI. Residual chloride left from a vapour-den- 

 sity experiment of the material No. IV. 



Analyses of Tungsten Hexachloride, WC1 6 . 



I. II. III. 



Weight of chloride taken ^"1974 15719 2-0284 



„ tungsten obtained 1*0117 °'732i 0-9508 



„ silver chloride 47654 3'394! 4*34^7 



Percentage of tungsten 46-04 46*57 46*87 



chlorine 5364 53-42 53*01 



99*68 99*99 9988 



IV. V. VI. 



_A 



Weight of chloride taken 1*4185 1*3744 08443 1*6678 09210 



„ tungsten trioxide ... 0-8036 °*9757 °*54 2 3 



„ silver chloride 3*o54° 1-8220 1*9823 



Percentage of tungsten 46*37 46*39 46-69 



„ chlorine 53*26 53*39 5322 



99*63 99*7 8 99*9 r 



Calculated. Mean fouiR.. 



Tungsten, W =184 46-35 46-40 



Chlorine, Cl G = 2i3 53*65 53*32 



397 ioo'oo 998 1 



SER. III. VOL. V. G 



