Memoir upon Animal Fat. 7S 
As the heat of the B. M. was not sufficient to dissolve 
the phosphorus employed, 1 made other mixtures of fat 
and phosphorus in different proportions, which I brought 
to the boiling point: this method favoured its solubility. 
After many trials, I ascertained that one ounce of fat, at a 
slight ebullition, can dissolve five grains of phosphorus, 
a part of which js precipitated upon cooling. 
This phosphorated fat was washed several times in boil- 
ing water: the washings were acid, blackened the nitrate of 
silver, and formed a flaky precipitate with lime water: this 
water had taken from it its acid property, but not that of 
blackening the nitrate of silver: thus, one part of the phos- 
phorus remained in a true solution without acidifying. 
These two kinds ef phosphorated fat, that which had 
been prepared in B. M., and that prepared by ebuliition, 
either washed or not, emitted no light in the dark at a tem- 
perature of 10°15 (50°27 Fahr.), nor even by rubbing with 
the hand; but if the temperature was raised to 60° (140° 
Fahr.), the luminous effects were a Jittle visible. The phos- 
phorated fat, the undissolved phosphorus of which. had 
been carefully separated, did not shine in the ordinary tem- 
perature. 
I distilled twelve grains of phosphorus with two ounces 
of fat: the matter soon assumed a charry appearance, much 
more speedily than common fat submitted to the same ope- 
ration; there was liberated at the beginning, phosphorated 
hydrogen gas, which took fire in the receiver ; and we after- 
wards obtained under a bell-glass, in the mercurial appara- 
tus, phospkorated hydrogen gas and carbonated hydrogen 
gas. The receiver contained fat which had been blended 
with phosphorus and phosphorated hydrogen gas. After 
cooling, it took fire with the contact of the air, and burned 
the fat rapidly. 
Whatever is the temperature, therefore, employed to dis- 
solve phosphorus in fat, there is formed every time a 
greater or less quantity of phosphorous acid :—this inclines 
me to think that the same thing happens in many other 
hosphorated compounds. 
M, Bouillon Lagrange last year, in his lectures upon fixed 
and 
