46 Analysis of Acorm, [July, 



remaining solution evaporated to dryness, left a moist residuum 

 of 2*25 grs. carbonate of potash, with a trace of magnesia. 

 1 muriate of silver = '18 muriatic acid = '3 muriate of magne- 

 sia. 1*25 carbonate of silver n= '2 carbonic acid = '63 carbo- 

 nate of potash. 



Hence we have the soluble part composed of 



Carbonate of potash -63 



Potash -82 



Muriate of magnesia '30 



(B. 2.) The insoluble matter was dissolved in dilute muriatic 

 acid. The residuum weighed •125. Into the solution was 

 poured prussiate of potash, which gave a precipitate of about '05 

 gr. ; carbonate of potash was then added in excess, which gave 

 a precipitate of 3-85 grs. and after boiling a further precipitate 

 of '6 gr. 



Hence the composition of the insoluble matter is, 



Silex -125 



Iron -026 



Lime 2-0 



Magnesia , "6 



2-75 



Exper, 3. Analj/sis of Acorns. — 5000 grains of peeled acorns 

 were pounded in a mortar tolerably fine, and in this state they 

 stood two or three days. The colour of the mass darkened, and 

 became a deep-brown. They were triturated repeatedly in a 

 marble mortar with water, and thrown on a seive, upon which 

 they were well washed with water until it came off colourless : 

 13 pints of water (E) were employed. It was of a pale leather- 

 brown, and deposited starch (F). It did not change the colour 

 of turmeric or litmus papers, or of turmeric reddened with an 

 alkali. The insoluble matter (G) still remained of a chocolate 

 colour, and had a chaffy appearance ; three pints of cold water 

 (H) were added to it, and put in the oven all night at a heat of 

 about 180'^. The water had acquired a deep-brown colour 

 owing to the extract it had dissolved. It was poured off in the 

 morning, having stood about 10 hours. The matter (G) had 

 then a pale leather colour, which soon became darker on expo- 

 sure to the air ; two pints more water (I) were then added to it, 

 and it was again placed in the oven for four hours. This water 

 having dissolved another portion of the extract was poured off, 

 and two pints more (J) added, which, having stood in the oven 

 several hours, was, in like maimer, poured off, and two more 



