MR. SCHUNCK ON RURIAN AND ITS PRODUCTS OF DECOMPOSITION. 101 
I. 0*6220 gfm., dried at 100° C. and burnt with oxide of copper and chlorate of 
potash, gave 0*8670 carbonic acid and 0*2365 water. 
0*7770 grm. gave 0*4035 chloride of platinum and ammonium. 
0*9630 grm. gave on being incinerated 0*2350 carbonate of lime. 
II. 0*4885 grm. of another preparation gave 0*6865 carbonic*^ acid and 0*2060 
water. 
0*1540 grm. gave on being incinerated 0*0370 carbonate of lime, containing 0*02076 
lime =13*48 per cent. After being treated with sulphuric acid and again heated, it 
weighed 0*0500 grm., which, estimated as sulphate of lime, is equivalent to 0*02062 
lime =13*39 per cent. 
From these numbers maybe deduced the formula Qg N, O 40 + 4 CaO, as the 
following calculation shows : — 
Carbon , . . 
Eqs. 
Calculated. 
I. 
II. 
. 56 
336 
40*48 
40*93 
41*20 
Hydrogen . . 
. 34 
34 
4*09 
4*22 
4*68 
Nitrogen 
2 
28 
3*37 
3*26 
Oxygen . . . 
. 40 
320 
38*57 
37*90 
Lime . . . 
4 
112 
13*49 
13*69 
13*48 
830 
100*00 
100*00 
If this be the true composition of erythrozym, it stands in a very interesting rela- 
tion to that of rubian. If to 1 equiv. of rubian be added the elements of 2 equivs. of 
nitric acid, the sum will represent the composition of the organic substance con- 
tained in the erythrozym in combination with lime, C^g H 34 Ogo-f 2 N 05 =C 56 H 34 N 2 O 40 . 
I shall now give the results of an analysis of erythrozym which had been employed 
for the decomposition of a quantity of rubian, and then treated successively with 
cold water and boiling alcohol until all the products of decomposition were entirely 
removed, 
0*5330 grm., dried at 100 ° C. and burnt with oxide of copper and chlorate of pot- 
ash, gave 0*8325 carbonic acid and 0*2220 water. 
0*2780 grm. gave 0*1835 chloride of platinum and ammonium, 
0*0645 grm. gave on being incinerated 0*0130 carbonate of lime, containing 
0*00729 lime. 
These numbers lead to the following composition : — 
Carbon . . 
Eqs. 
Calculated. 
Found. 
. . 52 
312 
44*82 
44*99 
Hydrogen . 
. . 32 
32 
4*59 
4*62 
Nitrogen 
. . 2 
28 
4*02 
4*14 
Oxygen . . 
. . 30 
240 
34*51 
34*95 
Lime . . , 
. . 3 
84 
12*06 
11*30 
696 
100*00 
100*00 
MDCCCLIII. 
