1826.] Ahalysis of Acorns, 4^ 



pints added, heated, and poured off. These several portions of 

 water were then poured together. 



The insoluble matter (G) was then dried at a moderate heat, 

 and weighed 872 grs. 



A few grains of this insoluble matter (G) being put into a 

 solution of carbonate of potash, which, after digesting awhile at 

 a moderate heat, dissolved nearly the one-half of it. 



The solution of extract (H, I, J,) was tested with the following 

 reagents. 



Nitrate of silver, a copious deep-reddish brown precipitate, 

 redissolved in dilute nitric acid, leaving a residue. 



Oxalic acid, no change. 



This solution being evaporated to dryness left a deep-brown 

 matter (K), weighing 180 grs. being extractive. 50 grs. of it 

 were put into about an ounce of alcohol of commerce to digest 

 at a heat of about 45° or 50° for seven days, when it had lost 

 9 grs. of its weight, which were taken up by the alcohol. The 

 alcohol was evaporated, and the residuum, a dark-brown matter, 

 appeared to be a part of (K) altered ; for when redissolved in 

 water, it gave with 



Nitrate of silver, a precipitate in white flakes. 



Carbonate of potash, a brown precipitate. 



Sulphuric, nitric, and muriatic acid, no change. 



Prussiate of potash, no change. 



(E.) The soluble matter (E) was poured off the starch (F), 

 which was washed with water, and the washings added to (E) 

 after the starch had subsided. 



The starch (F) was thrown upon a filter, and then dried, at a 

 moderate heat, when it weighed 910 grains. 



The water (E) was partly evaporated, and then filtered. It 

 gave a smell resembhng mushrooms, and an oily matter floated 

 on the top, of a brown colour. What was left on the filter (E) 

 was of a glutinous nature, brown, and weighed, when dried, 

 145 grs. The water was again evaporated, until it was reduced 

 to about 12 ounces, when a further precipitate was formed, 

 which was separated by the filter, and weighed 17 grs. (M.) It 

 was then evaporated to dryness, and the residuum weighed 

 207 grs. 



A portion of this when redissolved in water gave a white pre- 

 cipitate with muriate of tin, acetate of lead, and nitrate of silver. 



