80 
Proceedings, of Royal Society of Edinhurgli. [dec. 19 , 
As the quantity of dibenzyl phosphine at our disposal was small, ' 
we could not repeat the experiment so as to obtain a new quantity 
of the chlorinated body for analysis, but it can scarcely be doubted 
that it is of the same nature as the brominated body, and that its 
formula is in all probability (C 7 H 7 ) 4 H 2 P 2 Cl 2 . 
Examination of Bye Products. — (A) Crystalline Substance 'precipi- 
tated hy Hydrochloric Acid from the Potash Solution used to extract 
the viscous mass containing the crude Dihenzyl Phosphine . — This 
substance was precipitated in crystalline flocks on addition of 
hydrochloric acid to the potash solution. It was very sparingly 
soluble in cold water — rather more so in hot water, and crystallised 
from a boiling aqueous solution in indistinct leaflets. That the 
substance had acid properties was proved by the readiness with 
which it dissolved in potash solution and in caustic baryta. A 
slight residue was, however, left in both cases, and indeed an 
impurity appeared to be present extremely difflcidt to get rid of, 
as the following analyses show : — 
Obtained, 
K 
Calculated for 
(C7H7)20HP0 
68-3 
Carbon, 
a) 
59-69 
(2) 
66-3 
(3) 
67.06 
Hydrogen, . 
5-8 
6-3 
6-5 
6-1 
Phosphorus, 
16-2 
12-5 
12-6 
(1) Crude product 
washed with water. 
(2) Precipitated from a solution of the crude product in baryta water 
by hydrochloric acid, and carefully washed (melting point 183° C.). 
(3) Several times precipitated from baryta solution by hydro- 
chloric acid, then recrystallised from alcohol and water (melting 
point 185’5). 
Barium Salt. — Obtained by dissolving the crude product in 
baryta water and subsequent precipitation of the excess of baryta 
by a stream of carbonic anhydride. The salt crystallised from the 
highly concentrated solution in radiating tuffs of crystals. 
Obtained. Calculated for 
f > ■[(C7Hjr)2P02|Ba 
Barium, .22-2 21 *8 21 -8 
Calculated for 
{C,H,)2P02}^Ba,llH20 
23-7 
Water. 
. 24-0 
