74 Memoir upon Animal Fat. 
M. Vogel, if sulphur, divided by any other vehicle, (thick 
mucilage or gelatine, for instance,) acts mm an analogous 
manner. I suspect, however, that when it is employed in 
friction, divided by means of one of these bodies, its results 
would be different from those of sulpbur dissolved in fat. 
If we raise the sulphurated fat to the boiling poimt, and 
if itis hastily decanted and cooled, a part of the sulphur is 
precipitated ; but if it has been allowed to cool slowly, the 
sulphur then crystallwes in beautiful needles. 
When we distil in the open fire sulphurated fat in a 
Juted glass retort, and receive the products over mercury, 
we obtain a great quantity of gas, which, being collected 
and examined, appears to be.a mixture of plenty of sulphu- 
gated hydrogen gas, carbonated hydrogen gas, and a little 
carbonic acid gas. We never found any sulphurous acid 
gas, as several chemists have asserted. 
From the moment that the elastic fluids cease to pass, 
white thick vapours are perceived, condensing with difh- 
culty, and there is sublimed at the neck of the retort a yel- 
Jow matter, which was merely fat mixed with a little sul- 
phur: the liquor of the receiver looked milky ; it yielded, 
upon cooling, small white crystals; this was merely sul- 
phur in minute division. The retort contained a brilliant 
prismatic charcoal in abundance. 
Sulphurated hydrogen gas, passed through melted fat, 
effected no change on it, and was not dissolved in it. 
Phosphorus. —I melted, says the author, half an ounce of 
fat in B. M.; I added, after the fusion, two grains of good 
phosphorus, very transparent; I kept the whole for ait 
a quarter of an hour at the same temperature : I took care 
not to-agitate the liquid too much, in order to avoid the 
action of the air, which would have acidified the phos- 
phorus. 
When the fat was cold, I recovered a part of the phos- 
phorus which was not dissolved. This fat had a slight 
smell of garlic, and a disagreeable taste ; it reddened turn- 
sole ; it formed a very abundant black precipitate with the 
nitrate of silver, and a Jess abundant precipitate of the same 
colour with the neutral nitrate of mercury at the minimum. 
As 
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