329 
The following data were obtained in determining the vapour 
density : — - 
Temperature of air 20° Cent., 
,, of vapour at sealing 247° Cent., 
Excess of weight of balloon *810 gramme, 
Capacity of balloon, 165 cub. centimetres, 
Residual air, . 7 ,, ,, 
Barometer, 30*20 inches. 
Density, 9*417 inches. 
The formula C g Cl g 0 2 requires 265 x *0346 = 9*169. 
This oil is not decomposed by sodium, or at least very slowly, even 
with heat. It is not affected by boiling with oxide of silver, oxide 
of mercury, or even baryta water. 
When the substance is agitated witli water and cooled to 6° Cent, 
a crystalline hydrate is formed, which, according to Plantamour, 
fuses at 15° Cent. = 59° Fahr. This hydrate is C g Cl g 0 2 + 2H0 
(Staedeler). It often appears as a net-work of long crystals on the 
sides of the bottles in which the oil is formed, but these crystals may 
sometimes be heated considerably above the fusing point given by 
Plantamour without melting. I found, on keeping the oil under 
water for some months, that it turned into an opaque white mass 
of crystalline plates, which did not fuse till heated to a tempera- 
ture of about 40° Fahr. When these crystals were melted again 
under water, they solidified shortly after cooling, without the fusing 
point being lowered. As this does not happen when the oil is freshly 
made, it is probable that the hexachlorinated acetone passes into 
some isomeric modification like the analogous body chloral. This 
hydrate disolves very readily in ether in the cold, giving long crys- 
tals covering the sides of the basin as the ether evaporates. If heat 
be employed to dissolve the crystals, the hydrate is decomposed and 
the oil separates. 
When gaseous ammonia is passed into hexachlorinated acetone, it 
becomes solid, and there is an evolution of chloroform. The solid 
substance was washed with water, and crystalised from alcohol, when 
it formed large pearly square tables. A few grains of this body 
left some hours in the water-bath entirely volatilises. Its character 
and composition agree exactly with trichloracetamide, the following 
numbers having been obtained on analysis ; — 
