48 
It is difficultly soluble in alcohol and ether, more soluble 
in carbon tetrachloride and benzole, freely soluble, even in 
the cold, in carbonic disulphide and oil of turpentine. 
From all the above solutions except that of the turpen- 
tine it crystallises in beautiful silky rhomboidal plates, which 
on drying interlaminate, and possess a delicate light yellow- 
ish green colour and silky lustre. From the turpentine it 
crystallises in beautiful white lance-shaped crystals con- 
gregating in tufts. Its subliming point lies considerably 
below its boiling point, indeed not far above its melting 
point. 
It may be obtained perfectly white by carefully subliming 
the recrystallised substance at as low a temperature as 
possible. If the semi-purified body be recrystallised from 
any of the above named solvents, the mother liquors on 
filtering are found to have acquired a beautiful blue fluores- 
cence, but the perfectly pure substance no longer yields a 
fluorescent solution. 
A mixture of two parts of potassium bichromate and sul- 
phuric acid, cause energetic oxidation of this substance, but 
no colouring matter is obtained by treating the product of 
oxidation so obtained, by Perkins’ method for obtaining 
alizarin from antlirachinon. 
Cold sulphuric acid is without action upon it. Warm 
sulphuric acid dissolves it, if pure, with a slight purplish 
colour. If containing any of the yellow substance which 
always contaminates the crude body, the warm acid assumes 
a blue colour, which on further warming becomes green and 
then brown. 
Nitric acid oxidises it, with liberation of nitrous fumes. 
Chlorine passed over it in the cold does not affect it, and 
apparently not even on slightly warming. 
I find that it is impossible to distill naphthalin to dryness 
in any quantity, without this body being formed in minute 
quantity. If an appreciable quantity be not obtained on 
