50 REDTENBACHER ON THE COMPOSITION OF STEARIC 
and 0°7275 gr. water, which represented in 100 parts is 
is Carbon) ys os6 4. eS aS 
Hydrogen) > 3. th OG 
Oxygen). oN Sed Owe 
The incompatibility of these results induced me to repeat the 
combustions several times. 
II. 0°5255 gr. gave 1°452 gr. carbonic acid, and 0°603 gr. water. 
III. 0°363 gr. gave 1-010 gr. carbonic acid, and 0°429 gr. water. 
IV. Of the same acid once more crystallized from alcohol, 
0°302 gr. gave 0°8355 gr. carbonic acid, and 0°352 gr. water. 
In order to ascertain whether other specimens of stearic acid 
had the same composition, an acid which was in the possession 
of Professor Liebig, and which had the same melting point, was 
submitted to combustion with oxide of copper. 
V. 0°345 gr. gave 0°9495 gr. carbonic acid, and 0°3995 gr. 
water. 
With the same object in view, an acid prepared in a similar 
manner from a soap of ox fat, and which melted at 70° C. (158°F.), 
was burnt with oxide of copper, when the following result was 
afforded :— 
VI. 0°3145 gr. of the substance gave 0°871 gr. carbonic acid, 
and 0°3575 gr. water. 
VII. 0°3055 gr. of the same substance when burnt with oxygen 
yielded 0°8485 gr. carbonic acid, and 0°3485 gr. water. 
The following is a comparative view of these seven analyses 
represented in 100 parts :— 
i Il. IIl. Iv. v. Vi, ‘Vite 
Carbon . 76°53 7640 76°93 7682 7664 76°57 76°79 
Hydrogen 12°95 12°75 13°13 12°95 12°96 12°64 12°67 
Oxygen. 10°52 10°85 9°94 10°23 10°40 10°79 10°54 
The stearate of silver obtained by the precipitation of an alco- 
holic solution of the soda salt, by means of a solution of silver, 
was a white, very voluminous, flocky precipitate, which however 
floated on the surface of the liquid; the results ofits analyses were 
as follows :— 
0°6325 gr. of this salt gave of silver 0°182 gr.= 28°79 per cent. 
0°9495 eee eee 0°2705 =28°49 wn 
0°5825 ees eee 0°1665 =28°58 =. 
