530 Wisconsin Academy of Sciences, Arts , and Letters. 
A most interesting matter, both from the theoretical stand¬ 
point and the properties of the products, is the fact that boron 
compounds like B Br 3 , for example, form a remarkable num¬ 
ber of so-called addition products with compounds of the kin¬ 
dred elements on the three sides of the triangular field occupied 
by boron. Some of these compounds are: 2 B Br 3 , P Cl 3 ; 
2B Br 3 , PC1 5 ; B Br 3 , P H 3 ; B Br 3 , P Br 3 ; B Br 3 , BIST H 3 ; but 
As Br 3 and Sb Cl 3 merely dissolve in B Br 3 , no definite com¬ 
pounds separate. At the present time I am interested in the 
preparation of compounds of aluminum halides and boron hal¬ 
ides. A1 Cl 3 and B Br 3 appear to give a definite compound, 
but as yet I have not completed an analysis of it. Plowever, 
it appears to break up under high temperature and in hydrogen 
atmosphere to a boride of aluminum. 
Of the compounds mentioned that with ammonia is of most 
interest to me theoretically. Indeed, it was the study of this 
compound which lead me to attempt to prepare some new or¬ 
ganoboron compounds by starting with B Br 3 and members of 
those classes of organic compounds characterized by the pres¬ 
ence of an 1ST PL group, or the PT H group (imido), or H only 
as in the case of pvdrine, quinoline and others. Thus far my 
work has been principally upon amines and pyridine. 
If solutions of B Br 3 and aniline in carbon tetrachloride, 
carbon bisulphide or benzine are brought together drop by drop 
an insoluble, amphorous precipitate appears. The action is 
accompanied by great evolution of heat. When the precipi¬ 
tate is carefully dried in a nitrogen or hydrogen atmosphere and 
analyzed it is found to be 2 B Br 3 , CeBLUPL. With an excess 
of aniline and higher temperature of reacting system there re¬ 
sults a yellow substance analyzing up to 2 B Br 3 , 3 C 6 PLPnp 2 - 
The first decomposes water quite violently, while the latter acts 
slowly on water giving B(OPI ) 3 and aniline hydrobromide. If 
the 2 B Br 3 , 30 JI 5 PLEI 2 is allowed to stand in a strong light in 
an air tight dessicator in which there is some strong alkali in 
a separate dish, PI Br is evolved from the substance and there 
remains what analyses up to a sort of boro-nitride of anniline. 
When the product is placed in water but very slight decompo- 
