116 _ HENRY G. SMITH. 
of somewhat constant composition, as the analyses of this 
and the previous sample agree very closely. The water. 
present does not. appear to be necessary to its chemical 
formula, because after removal from the log the powdered 
material steadily lost weight in the air, and practically the 
whole of the water was driven off at a temperature not 
exceeding 54° C. :— | 
Heated in air oven for 2 hours at 50—54° C., loss=29°8% 
re 2, re 1 hour at 100—110°0., ,, =0°24% 
c Fe tt 1 hour at 160—180° C., ,, none 
.. loss of water = 30°04?! 
The dried material was then ignited before the blowpipe 
until constant in weight when 41°36 had been burnt away, 
leaving 28°6% of alumina. The residue consisted practically 
of alumina, the merest trace of lime being detected, and a 
quantitative determination gave practically 1007? of alumina. 
The composition of the material may be thus stated :— 
Alumina —= 28°60 per cent. 
Succinic acid = 41°36 5 
Water = 30°04 ” 
with traces of lime and free butyric acid. 
In the previous paper (this Society 1895) the formula 
arranged from the results was AI,(C,H,O,);AlLO;. This 
formula is again derived from this present material, as by 
discarding the water the following results are obtained :— 
Alumina = 40°88 per cent. 
Succinic acid = 59°12 5 
100°00 
The above formula gives theoretically 
2 Al.O; = 40°617 per cent. 
(C,2H,.0,) — 59°383 9 
100°000 
1 The purest white material was taken for these determinations. 
