Bayley — On Complex Oxides of Cobalt and Nickel. 103 



ickel used. 



Iodine found. 



Theory of Iodine 

 for Nis O4. 



grains. 



grams. 



grams. 



•1835 



•2009 



•2642 



•1835 



•1812 



•2642 



•1835 



•2321 



•2642 



.1835 



•3310 



•2642 



•1835 



•2830 



•2642 



•1835 



•3765 



•2642 



•1835 



•1069 



•2642 



In the last experiment the solution was boiled for a few days. 



A quantity of cobalt nitrate was now mixed with soda and sodic 

 hypochlorite, and allowed to stand in a warm place until effervescence 

 had ceased. The precipitated oxide of cobalt was then well washed 

 with warm water and dried, till constant, under the air pump, over 

 strong sulphuric acid. 



A sample of this oxide was then submitted in succession to various 

 temperatures. The results were as follows : — 





grams. 





grams. 



Oxide taken, . 



•9278 



(C03O5, 4H3O). 





Oxide dried at 100° C, . 



•8760 



Theory for C03O5, SH.O, 



. -8770 



„ „ „ 138° C, . 



•8223 



„ „ C03O5, 2HA 



. -8263 



„ „ „ 310° C, . 



•7548 



„ „ C03O5, H,0, 



. -7756 



After this experiment there was an appearance of change on the 

 surface of the oxide. 



grams. grams. 



Oxide after ignition to redness, . -6840 Theory for C03O4, . '6798. 



Another portion of the same sample : — 



grams. grams. 



Oxide dried at 100° C, . -4070 (^CosOs, 3HoO). 

 Oxide after ignition I _ .3^25 Theory for C03O,, -3154. 

 to redness, ) 



Another sample prepared in the same way, but left longer over the 

 air pump : 



grams. 



Oxide taken dried over II2SO4 . -7083. 

 The oxide was now heated to low redness in a tube in a current of 



K. I. A. PROC, SEE. II., VOL. III. — SCIENCE. I 



