684 PROFESSOR T. ANDERSON ON THE 
on the hydrogen.* Oxide of copper and chlorate of potash were therefore resorted 
to, and with success. The results are :— 
16:250 grains of carbonic acid, and 
2°435 grains of water. 
4-546 grains of anthracene gave 
Ji 
-4:715 grains of anthracene gave 
1G 
15720 grains of carbonic acid, 
2°420 grains of water. 
4-975 grains of anthracene gave 
III. ¢ 17-180 grains of carbonic acid, and 
2°650 grains of water, 





Experiment. Mean. Calculation. 
I, II, III. 
Carbon, . . 9400 9431 9418 94-16 94:38 ©,, 168 
Hydrogen, . 5°74 5-91 5-92 5°85 662 .H,, 10 
99°74 100-22 10010 100°01 100-00 178 
The results correspond exactly with the formula C,, H,,. This is precisely the 
constitution of a substance described some years since by FritscHEt asa new 
carbo-hydrogen, obtained from coal-tar, with which also its properties closely 
agree. A careful comparison of the two substances made by Professor FritscHE 
and myself, during a visit he paid to Glasgow some time since, satisfied us that 
his substance really is anthracene. ‘The picric-acid compounds of the two are 
completely identical, and have a fine ruby-red colour, which distinguishes it from 
those obtained from the other carbo-hydrogens. An analysis of the compound 
obtained from anthracene gave— 
5:120 grains of picrate of anthracene gave 
11-016 grains of carbonic acid and 
1:629 grains of water. 


Experiment. Calculation. 
a 
Carbon, . : ¢ : ; 58-71 58:97 C,, 240 
Hydrogen, : : 5 : 3°54 Sele EES As 
Nitrogen, : : : : sie 6:88. N, . 42 
Oxygen, . : : : : 5a 30:98 O,, 112 
100-00 407 
This corresponds with the formula C,, H,,+C,, H; (NO,); O., which is that given 
by Fritscue for his compound. 
* J have had frequent occasion to observe, that in the analysis of carbo-hydrogens with chromate 
of lead a considerable excess of hydrogen is often obtained. 1 at first attributed this to impurities 
in the chromate, but analyses made with a pure material, specially made for the purpose, showed 
the same excess. I have not examined into the cause of this phenomenon. 
+ Erdmans Journal fiir Practische Chemie, vol. lxxiii. p. 282. 

