~” 
78 J. P. Cooke on Danalite from Rockport, Mass. 
Separation of Sesquioxyd of Iron from Alumina, Glucina, and 
most of the rare earths —The method of Mr. H. Sainte-Claire 
ter adapted to the purpose, and would serve many other use- 
ful ends in the laboratory. In addition to the tube, a small 
platinum nacelle would be required, as large as the tube will 
admit and about 14” in length. With such an apparatus the 
method of conducting the process is as follows: The tube 
having been mounted horizontally on any convenient stand, 
one end of it, which is closed by a doubly pierced india rub- 
ber cork, is connected on one side with a small hydrogen 
generator and on the other with a small flask for generating 
hydrochloric acid gas. To the other end of the tube is fastened 
by an india rubber connector a small glass adapter, so curved 
that the end may dip under water. The mixed bases, whose 
total weight is known, having been placed in the nacelle in a 
finely pulverized condition, and the nacelle having been intro- 
duced into the tube, the heat of a single Bunsen burner is 
applied, while a gentle current of hydrogen is caused to flow 
ough the apparatus. In the course of half an hour all the 
the heat is then withdrawn, and the current of hydrochloric 
acid gas being again replaced by a current of hydrogen, the 
apparatus is allowed to cool. The alumina, or whatever earth 
may present, is left behind in the nacelle in a perfectly pure 
condition and can be at once weighed, while the weight of ses- 
quioxyd of iron is known from the loss. If the product is not 
perfectly white the nacelle should be returned to the tube and 
the process repeated. The result can be controlled by also 
weighing the nacelle after the reduction of the iron, but it is not 
safe to estimate the amount of i e loss 0 
weight at this time, since a very small error in this determina 
tion would cause an important error in the calculated amount 
* Annales de Chimie et de Physique, Tome xxxviii. 
