114 FORMATION OF FLINT, 



and they 60 not produce the same effects oh lard as the ni- 

 trates of mercury, 

 ©enerai ccn- From the facts here adduced we may infer, 

 elusions. i^ That light, without air, turns lard yellow, and gives it 



an acrid, rancid taste, without acidifying it. 



2. That lard yields no ammonia by distillation, and con- 

 tains no nitrogen, so that it may be considered as a purely 

 vegetable substance. 



3. That in the sulphur pomatum a portion of sulphur is 

 dissolved, without being acidified. 



4. That phosphorus dissolves in it, but is quickly changed 

 into phosphorous acid, and its acidification is increased by 

 the contact of air. 



5. That lavd oxigenized by long exposure to air constant-^ 

 ly becomes acid. That the water with which it is washed 

 precipitates some metallic solutions, and, if distilled, gives 

 oi^t at last acetic acid. ■ 



C. That nitric acid forms with lard a yellow bitter sub^ 

 tance, acetic acid and mucous acid. That the latter can- 

 not be completely separated from it by washing ; and that 

 it is equally obtainable from suet by means of nitric acid, 



7. That the oxigenized muriatic acid is decomposed by 

 lard, which it leaves whitish, very soft, and incapable of fur- 

 nishing the yellow bitter matter, when subsequently treated 



<. with nitric acid. 



8. That mercury is in the metallic state, but very minute* 

 ly divided, in fresh prepared mercurial ointment. 



9. 1 hat in the unguentum citrinum the mercury is a ni- 

 trate with oxide at a minimum : that the white appearance 

 of the surface is owing to bubbles of gas: and that the neu- 

 tral nitrate ot" niercury at a minimum is decomposed in lard, 



VII. 



Extract of a Memoir of Mr, HaqueTj on the Formation of 

 Flint*. 



Flint of recent "^ ^^^^ the vai'ions proofs, which this gentleman has 

 forniation. adduced of the recent formation of flint, we shall cite the 

 following. 



* Journal (i§s Mines, No. 119, p. 405. November, t806. 



In 



