Description of Edwardsite. ; 165 
C. The acetic solution (B) was evaporated to dryness and water 
affused whereby flocculi of silicic acid a ppeared in the solution, which 
were separated by a double filter, washed, ignited and weiabed 0.25 
centigramme. 
D. The filtered solution (C) was treated with acetate of lead so 
long as any precipitate went down. The precipitate was separated, 
washed, and heated to redness. It weighed 68 centigrammes, which 
consisting of the subsesquiphosphate of lead, is equivalent to 12 cen- 
tigrammes of phosphoric acid. 
I. The undissolved. matter from the alkaline solution B, which 
had a yellowish white color, was digested in hydrochloric acid for 
several hours, during which chlorine was emitted and the matter 
which was not taken up changed from yellow to reddish brown. 
The solution was withdrawn from the undissolved portion and pre- 
cipitated by potassa with ebullition. The precipitate had a bluish 
gray color. When washed and ignited, it weighed 15 centigrammes, 
and had a chestnut brown color. 
F. The alkaline solution (E) was rendered slightly acid by means 
of hydrochloric acid, after which ammonia was added; a white 
flocculent precipitate appeared. It was separated from the solution 
by the filter, and after washing was treated with hydrochloric acid, 
whereby about two thirds of its bulk were dissolved; the remainder 
was silicic acid. ‘The solution was transferred to a flask and digested 
for several hours, with exeess of carbonate of ammonia, in a mild 
temperature. That portion of the precipitate which was not taken 
up by the ammoniacal solution, was separated, washed, and estima- 
ted by means of the double filter at 2 centigrammes. 
G. The ammoniacal solution from which the alumina was separa- 
ted (E) being boiled for a few minutes, became milky ; but after 
being evaporated to dryness and ignited in a platinum capsule, the 
residuum of glucina was too small to be appreciated by the balance. 
H. The solution from which the alumina and glucina had been 
precipitated by ammonia (F’) was tested for lime by the addition of 
oxalate of ammonia. No cloudiness was occasioned by the oxalate. 
After some hours standing, the solution was treated with phosphate 
of soda, whereby its transparency was slightly affected. 
I. The 15 centigrammes of a chestnut brown powder (E) were 
digested for some time in hydrochloric acid and finally treated with 
culplaade acid. ‘The matter remaining undissolved was separated, 
washed, and ignited. It weighed 3.5 centigrammes and had the 
