434 Scientific Intelligence. 
the form of which has not yet been determined. These crystals are 
sometimes garnet-red and sometimes honey-yellow; the color however 
does not appear to be essential and may arise from slight impurities. 
The crystals have a lustre and refractive power like that of the diamond. 
They scratch corundum with the greatest ease and appear to be almost, 
filled up, and the whole heated in a wind furnace to the temperature at 
which nickel melts, for five hours. The crucible after cooling is found to 
contain two layers, of which one consists of boric acid and alumina, the 
other of alumina penetrated with erystallized boron. The metallic layer 
is heated with boiling soda lye to dissolve the aluminum, then with mur 
atic acid, and Jastly with a mixture of nitric and fluohydric acids. The 
boron so obtained contains small plates of aluminum which can only be 
removed by mechanical means. 
| second 
. 
resembles carbon more closely than silicon—Ann. der Chemie 
macie, ci, 113. 
