1908-9.] Life and Chemical Work of Archibald S. Couper. 271 
phoric acid is separated from the crystals of salicylic acid, but as soon as this is done, 
the application of the test gives the intense and characteristic colour produced by 
the acid in question. An analysis which I have made confirms this result. 
0*301 grms. of these crystals, expressed between folds of bibulous paper, 
re-crystallised from water, and dried, upon combustion, gave 0*668 grms. of carbonic 
acid, and 0*116 grms. of water. 
Found. 
Calculated. 
Carbon 
60*52 
60*86 
Hydrogen 
4*27 
4*34 
In another analysis 0*2205 grms. of substance gave 0*4885 grms. of carbonic acid, 
and 0*0875 grms. of water, which, calculated, gives — 
60*42 % for carbon, and 4*4 % for hydrogen. 
This acid agrees also in all its physical aspects with the salicylic acid. 
It is evident, then, that those three bodies, — namely, the chloride of salicyl of 
Gerhardt, the chloride of chlorobenzoil, and the chlorobenzoilic acid of Chiozza, are 
not yet known. 
When the terchlorophosphate of salicyl is quickly distilled, hydrochloric acid is 
given off in considerable quantity, while the body, at the same time, acquires a dark 
colour. The last portion of the product of this distillation, which passes at a 
temperature above 300° Cent., being allowed to stand for a day or two in a closed 
tube, deposits large crystals, which, having been pressed between folds of bibulous 
paper, and submitted to analysis, gave the following results : — 
1 °. 0*3565 grms. of substance gave 0-5255 carbonic acid, and 0*074 grms. water. 
2°. 0*57 grms. of substance gave 0*826 grms. carbonic acid, and 0*101 grms. of water. 
1°. 0*255 grms. of substance gave 0*176 grms. of chloride of silver. 
Compared with the crude formula C 7 H 4 0 8 C1P, these results will be : — 
Carbon . 
Hydrogen 
Chlorine 
Found. 
I. II. 
40*2 39*16 
2*3 1*96 
17-07 
The rational formula is — 
C 
c 
c • 
H 2 
c 
H 
c- 
H 
c ■ 
*0 • 
O' 
C o 2 
( O 2 
-P ■ 
J 
\ 
c< 
lo- 
•0. 
I Cl 
Calculated. 
38-44 
1*83 
16*25 
The monochlorophosphate of salicyl being a body which is quickly decomposed 
by exposure to the air, and only to be obtained from a liquid passing at an exceed- 
ingly high temperature, I did not think it easily possible to obtain a purer body, and 
have contented myself with the above analysis. Although these analyses might in 
themselves leave some doubt as to the composition of the body, still, when taken in 
