284 



SMITHSONIAN MISCELLANEOUS COLLECTIONS 



VOL. 54 



General mean, 44.017, 



.0031 



Thorpe's figures alone give Ti = 48.025. 



The second ratio, which involved the weights of TiCl4 taken in the last 

 five determinations of the preceding series, inclnded the weighing of the 

 silver chloride formed. The TiCl^ proportional to 100 parts of AgCl is 

 given in a third colnmn : 



AgCl. Ratio. 



10.00235 33.114 



12.68762 33.111 



17.17842 33.117 



17.00703 33.125 



12.32442 33.125 



TiCl,. 

 3.31222 

 4.20093 

 5.68888 

 5.65346 

 4.08247 



Mean, 33.118, it .0019 

 Rose found, 33.156, ± .019 

 Demoly found, 34.581, ± .030 



General mean, 33.123, 



.0019 



Hence Ti = 48.044 (Thorpe). 



In the third series the chloride was decomposed hy water, and after 



evaporation to dryness the resulting TiO._, was strongly ignited : 



TiCl^. TiO.,. Per cent. TiO.. 



6.23398 2.62825 42.160 



8.96938 3.78335 42.181 



10.19853 4.30128 42.176 



6.56894 2.77011 42.170 



8.99981 3.79575 42.176 



8.32885 3.51158 42.162 



Mean, 42.171, ± .0022 

 Rose found, 42.933, ± .121 

 Demoly found, 38.294, ± .180 



General mean, 42.171, ± .0022 



Hence Ti = 48.095. 



